Public interface comment and function formatting improvements

All documentation comments are now /* */ and have a leading *.

All public functions have the type returned on one line and the function name on a new line.

All header files have less than 2% lines longer than 80 columns, no trailing spaces or tabs.

There is no behavior change at all in this PR, even though it is pretty large.



* Comment formatting improvements

* More comment formatting

* More comment formatting

* more comment improvements

* uniform formatting for function declarations

* More function and comment formatting

---------

Co-authored-by: Laurence Lundblade <lgl@securitytheory.com>
diff --git a/inc/qcbor/UsefulBuf.h b/inc/qcbor/UsefulBuf.h
index aa24507..5f53044 100644
--- a/inc/qcbor/UsefulBuf.h
+++ b/inc/qcbor/UsefulBuf.h
@@ -1,34 +1,35 @@
-/*============================================================================
- Copyright (c) 2016-2018, The Linux Foundation.
- Copyright (c) 2018-2022, Laurence Lundblade.
- Copyright (c) 2021, Arm Limited. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-    * Redistributions of source code must retain the above copyright
-      notice, this list of conditions and the following disclaimer.
-    * Redistributions in binary form must reproduce the above
-      copyright notice, this list of conditions and the following
-      disclaimer in the documentation and/or other materials provided
-      with the distribution.
-    * Neither the name of The Linux Foundation nor the names of its
-      contributors, nor the name "Laurence Lundblade" may be used to
-      endorse or promote products derived from this software without
-      specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
-WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
-ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
-BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
-BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
-IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- =============================================================================*/
+/* =========================================================================
+ * Copyright (c) 2016-2018, The Linux Foundation.
+ * Copyright (c) 2018-2022, Laurence Lundblade.
+ * Copyright (c) 2021, Arm Limited. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors, nor the name "Laurence Lundblade" may be used to
+ *       endorse or promote products derived from this software without
+ *       specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ========================================================================= */
 
 /*============================================================================
  FILE:  UsefulBuf.h
@@ -674,7 +675,7 @@
 {
    UsefulBuf UB;
 
-   // See UsefulBuf_Unconst() implementation for comment
+   /* See UsefulBuf_Unconst() implementation for comment */
    UB.ptr = (void *)(uintptr_t)UBC.ptr;
 
    UB.len = UBC.len;
@@ -1844,7 +1845,7 @@
       return SIZE_MAX;
    }
 
-   // Cast to size_t (from ptrdiff_t) is OK because of check above
+   /* Cast to size_t (from ptrdiff_t) is OK because of check above */
    const size_t uOffset = (size_t)((const uint8_t *)p - (const uint8_t *)UB.ptr);
 
     if(uOffset >= UB.len) {