Strip tabs and trailing white spaces, and fix end of files (#748)

* format: Strip trailing whitespaces

We want to get rid of trailing whitespaces completly as they make just git
noice. Much better to start using automated tools to get rid of them once and
not getting them back again. This way git history will be cleaner and review
easier.

Commit was generated with:

    pre-commit run --all-files trailing-whitespace

* format: Files should have exactly one new line end of them

It is good practice that every file has one new line. It is not now days so
mandatory but it also is not nice if file has lot of newlines end of it. We will
use pre-commit which takes automatically care about this so let's fix all.

Commit was generated with:

    pre-commit run --all-files end-of-file-fixer

* format: Convert tabs to spaces

Project mostly use spaces over tabs. When mixing tabs and spaces this usually
makes formatting issues and also when changing those in commits it will make lot
of git noise. We will force spaces most of the time and use pre-commit to fix.

Commit was generated with:

    pre-commit run --all-files remove-tabs

---------

Co-authored-by: Kari Argillander <kari.argillander@fidelix.com>

src/bacnet/bacerror.c

@@ -17,14 +17,14 @@
 /**
  * @brief Encodes BACnet Error class and code values into a PDU
  *  From clause 21. FORMAL DESCRIPTION OF APPLICATION PROTOCOL DATA UNITS
- * 
+ *
  *      Error ::= SEQUENCE {
- *          -- NOTE: The valid combinations of error-class and error-code 
+ *          -- NOTE: The valid combinations of error-class and error-code
  *          -- are defined in Clause 18.
  *          error-class ENUMERATED,
  *          error-code ENUMERATED
  *      }
- * 
+ *
  * @param apdu - buffer for the data to be encoded, or NULL for length
  * @param invoke_id - invokeID to be encoded
  * @param service - BACnet service to be encoded
@@ -41,7 +41,7 @@ int bacerror_encode_apdu(uint8_t *apdu,
     /* length of the specific element of the PDU */
     int len = 0;
     /* total length of the apdu, return value */
-    int apdu_len = 0; 
+    int apdu_len = 0;
 
     if (apdu) {
         apdu[0] = PDU_TYPE_ERROR;
@@ -69,9 +69,9 @@ int bacerror_encode_apdu(uint8_t *apdu,
 /**
  * @brief Decodes from bytes a BACnet Error service APDU
  *  From clause 21. FORMAL DESCRIPTION OF APPLICATION PROTOCOL DATA UNITS
- * 
+ *
  *  Error ::= SEQUENCE {
- *      -- NOTE: The valid combinations of error-class and error-code 
+ *      -- NOTE: The valid combinations of error-class and error-code
  *      -- are defined in Clause 18.
  *      error-class ENUMERATED,
  *      error-code ENUMERATED