Make include paths to private files relative (#946)

* Render include paths relative

By removing `etl/` from include paths (in `#include` statements), the path to the directory `include/` doesn't need to be provided to the preprocessor as an include path if the files in `include/etl/` are included by other means.
This has no disadvantages.
Actually the form `#include "..."` is intended to be used for relative paths in the first place.

This is relevant if one wants to include the source files from `include/etl` only indirectly.

For example we use special generated header files which wrap the include statement of the vanilla header files with diagnostic commands.
Those commands allow to disable diagnostic for ETL's files and re-enable them after the file inclusion.
Wrapper files are generated for every non-private header file.
We provide the directory with the wrapper files as include path to the preprocessor instead of the normal `include/` directory.
Thus include statements like `#include "etl/private/..."` are invalid in that case.

* Remove "etl/" from include paths in all files in `include/`.

33 findings in 4 files of 375.

See 9369619 for explanation.

include/etl/base64.h

@@ -26,13 +26,13 @@ SOFTWARE.
 #ifndef ETL_BASE64_INCLUDED
 #define ETL_BASE64_INCLUDED
 
-#include "etl/platform.h"
-#include "etl/static_assert.h"
-#include "etl/exception.h"
-#include "etl/error_handler.h"
-#include "etl/type_traits.h"
-#include "etl/enum_type.h"
-#include "etl/integral_limits.h"
+#include "platform.h"
+#include "static_assert.h"
+#include "exception.h"
+#include "error_handler.h"
+#include "type_traits.h"
+#include "enum_type.h"
+#include "integral_limits.h"
 
 #include <stdint.h>
 

include/etl/base64_decoder.h

@@ -28,19 +28,19 @@ SOFTWARE.
 #ifndef ETL_BASE64_DECODER_INCLUDED
 #define ETL_BASE64_DECODER_INCLUDED
 
-#include "etl/platform.h"
-#include "etl/static_assert.h"
-#include "etl/error_handler.h"
-#include "etl/type_traits.h"
-#include "etl/binary.h"
-#include "etl/algorithm.h"
-#include "etl/integral_limits.h"
-#include "etl/iterator.h"
-#include "etl/enum_type.h"
-#include "etl/delegate.h"
-#include "etl/span.h"
-
-#include "etl/base64.h"
+#include "platform.h"
+#include "static_assert.h"
+#include "error_handler.h"
+#include "type_traits.h"
+#include "binary.h"
+#include "algorithm.h"
+#include "integral_limits.h"
+#include "iterator.h"
+#include "enum_type.h"
+#include "delegate.h"
+#include "span.h"
+
+#include "base64.h"
 
 #include <stdint.h>
 

include/etl/base64_encoder.h

@@ -28,19 +28,19 @@ SOFTWARE.
 #ifndef ETL_BASE64_ENCODER_INCLUDED
 #define ETL_BASE64_ENCODER_INCLUDED
 
-#include "etl/platform.h"
-#include "etl/static_assert.h"
-#include "etl/error_handler.h"
-#include "etl/type_traits.h"
-#include "etl/binary.h"
-#include "etl/algorithm.h"
-#include "etl/integral_limits.h"
-#include "etl/iterator.h"
-#include "etl/enum_type.h"
-#include "etl/delegate.h"
-#include "etl/span.h"
-
-#include "etl/base64.h"
+#include "platform.h"
+#include "static_assert.h"
+#include "error_handler.h"
+#include "type_traits.h"
+#include "binary.h"
+#include "algorithm.h"
+#include "integral_limits.h"
+#include "iterator.h"
+#include "enum_type.h"
+#include "delegate.h"
+#include "span.h"
+
+#include "base64.h"
 
 #include <stdint.h>
 

include/etl/intrusive_forward_list.h

@@ -489,9 +489,9 @@ namespace etl
 
       reference operator *() const
       {
-#include "etl/private/diagnostic_null_dereference_push.h"
+#include "private/diagnostic_null_dereference_push.h"
         return *static_cast<pointer>(p_value);
-#include "etl/private/diagnostic_pop.h"
+#include "private/diagnostic_pop.h"
       }
 
       pointer operator &() const

include/etl/intrusive_list.h

@@ -528,9 +528,9 @@ namespace etl
 
       reference operator *() const
       {
-#include "etl/private/diagnostic_null_dereference_push.h"
+#include "private/diagnostic_null_dereference_push.h"
         return *static_cast<pointer>(p_value);
-#include "etl/private/diagnostic_pop.h"
+#include "private/diagnostic_pop.h"
       }
 
       pointer operator &() const