Fixes crashes on clipboard handling.
Also dont paste when there's nothing to paste.

The type definition of `sptr_t' depends on the compiler and C++ standard
being used, see external/scintilla/include/Scintilla.h and Scintilla's
upstream commit "Change definition of uptr_t and sptr_t to use
standardised types and headers"[0].

On OpenBSD 6.5/amd64, Clang 7.0.1 defaults to C++14,  thus `NULL' is
defined as `nullptr' so assigning it to `sptr_t' aka. `long' will fail.

Fix all callers (to the legacy Scintilla code) by using zero:

	/WndProc(/s,NULL,0,
	/glBindBuffer(/s,NULL,0,
	/glUseProgram(/s,NULL,0,

0: https://github.com/mirror/scintilla/commit/91bbc3c933d663b3bc9f4572cf1ed02d77922fde

Signed-off-by: Gargaj <gargaj@conspiracy.hu>

* Smart indentation support

Indentation support can be set to `smart` (default), `preserve` or `none` in the `gui` section of the config file.
Readme file has been updated accordingly.

Heavily based on SciTe official implementation.

* Make linux flavour use c++11

* Fix the wrong ident and make code more readable

* Rewrite in c++98, name config key “autoIndent”

Whitespaces do not count as empty here, so if a previous line contains whitespaces it will be taken into account and indentation will be set to that.

* More const correctness
* Converted "map.insert(make_pair(a,b))" pattern into "map[a] = b".
* removed some warnings (e.g. double->float conversions and sign mismatch)

- Change file structure to separate code from data and 3rdparty binaries.
- Move from make and VS solutions to cmake build system.

as per https://github.com/Searge-DP/Bonzomatic/commit/46d958346b1a88478aa3a0d29819e1264aa9f51f

also clear up keyword/type/etc lists

special thanks to
https://github.com/baldurk/renderdoc/blob/master/renderdocui/Resources/hlsl.xml
for a nice collection of HLSL keywords!