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/cov.h

@@ -108,18 +108,18 @@ int cov_subscribe_property_encode_apdu(uint8_t *apdu,
 
 BACNET_STACK_EXPORT
 int cov_subscribe_decode_service_request(
-    uint8_t *apdu, 
-    unsigned apdu_len, 
+    uint8_t *apdu,
+    unsigned apdu_len,
     BACNET_SUBSCRIBE_COV_DATA *data);
 
 BACNET_STACK_EXPORT
-int cov_subscribe_apdu_encode(uint8_t *apdu, 
+int cov_subscribe_apdu_encode(uint8_t *apdu,
     BACNET_SUBSCRIBE_COV_DATA *data);
 
 BACNET_STACK_EXPORT
 size_t cov_subscribe_service_request_encode(
-    uint8_t *apdu, 
-    size_t apdu_size, 
+    uint8_t *apdu,
+    size_t apdu_size,
     BACNET_SUBSCRIBE_COV_DATA *data);
 
 BACNET_STACK_EXPORT
@@ -134,7 +134,7 @@ void cov_property_value_list_link(
     size_t count);
 BACNET_STACK_EXPORT
 void cov_data_value_list_link(
-    BACNET_COV_DATA *data, 
+    BACNET_COV_DATA *data,
     BACNET_PROPERTY_VALUE *value_list,
     size_t count);