SDL Keyboard Input, Unix File Loading and SDL Window Config (#232)

* SDL2 and Unix fix

SDL2 keyboard input, Unix filesystem fix, and SDL2 editor window config, CMake cache gitignore

* Adding comments to the SDL2 keycode fix

For a better understanding

* Slimming down SDL Unix path translation

* Static pathfile compile fix

More pathfile code fix for the compile to work

* Re: Static pathfile compile fix

WickedEngine/wiHelper.cpp

@@ -382,7 +382,13 @@ namespace wiHelper
 	bool FileRead(const std::string& fileName, std::vector<uint8_t>& data)
 	{
 #ifndef PLATFORM_UWP
+#ifdef SDL_FILESYSTEM_UNIX
+		std::string filepath = fileName;
+		std::replace(filepath.begin(), filepath.end(), '\\', '/');
+		ifstream file(filepath, ios::binary | ios::ate);
+#else
 		ifstream file(fileName, ios::binary | ios::ate);
+#endif // SDL_FILESYSTEM_UNIX
 		if (file.is_open())
 		{
 			size_t dataSize = (size_t)file.tellg();