Additional GLSL Syntax Highlighting (#44)

* Added syntax highlighting for mat2, mat3, mat4 and int datatypes

* Added bool data type for syntax highlighting

src/platform_glfw/Renderer.cpp

@@ -28,6 +28,7 @@ const char * shaderType =
   "centroid flat smooth noperspective layout patch sample "
   "subroutine lowp mediump highp precision "
   "void float vec2 vec3 vec4 bvec2 bvec3 bvec4 ivec2 ivec3 ivec4 "
+  "mat2 mat3 mat4 int bool "
   "uvec2 uvec3 uvec4 dvec2 dvec3 dvec4 "
   "sampler1D sampler2D sampler3D isampler2D isampler1D isampler3D "
   "usampler1D usampler2D usampler3D "