updated makefile for supporting different target architectures

use "ARCH=arch_name make"

restructured project folder, implementations and headers together under sources/

NOTES/ABSURD_STUFF

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+GL_SHADING_LANGUAGE_VERSION​
+is different from
+GL_SHADING_LANGUAGE_VERSION
+the correct form is the second, taken from a compiler error, the first is text taken from
+https://www.khronos.org/opengl/wiki/OpenGL_Context
+(
+	there is an invisible blank at the end of the first string, 
+	it can be identified by moving the text cursor one step at the time​,
+	it doesn't show through selection since it has width 0, but the cursor movement skips a step due to its presence )
+
+verify by replacing in the following text:
+this phrase GL_SHADING_LANGUAGE_VERSION
+will change height on the screen depending on the label used 
+and can also make the compiler fail with an absurd "undefined reference"

NOTES/CHANGES_FROM_WINDOWS_VERSION

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+resource text files from WIN all had CRLF
+	add space the delete it and save
+
+GLES2 vs GL4
+	the GLSL files all needed
+		#version 300 es
+	
+	instead of 
+		#version 330 core
+	
+	also for the vertex shaders
+		/*this will affect all the float guys (float, vecN, matN )*/
+		precision mediump float;
+	
+	gl_FragCoord is still a varible in gles2 ( 300 es ) , while with gl4 (330 core) needs to be declared
+		commented out from declarations ( gl compiler fails on redeclarations ) 
+	
+	automatic casting of variables is not supported
+		added some .0 to integers in float expressions
+		also some cast through constructors ( i.e float(intVar) )
+
+InstancesLoader
+	changed
+	string root = path.substr(0, path.find_last_of("\\") + 1);
+
+	to
+	string root = path.substr(0, path.find_last_of("/") + 1);
+
+
+Main
+	disabled curve path drawing until rewrite using vertexbuffers ( currently using glBegin / glEnd which are not part of OpenglES 2 )

NOTES/COMPATIBILITY

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+in molte unità si usano delle chiamate disponibili solo da GL4 / GLES3.1
+
+# include <GL/glew.h>
+
+diventa
+
+# include <GLES2/gl2.h>
+
+più l'opzionale 
+# include <GLES2/gl2ext.h>
+
+
+anzichè riscrivere le funzioni mancanti rinominandole alla precedente versione d'estensione, si introducano delle macro da aliasing
+
+ma si potrebbe anche usare la guardia per racchiudere delle semplici definizioni
+
+void glDrawBuffers(GLsizei n, const GLenum *bufs){
+	glDrawBuffersEXT( n, bufs);
+}
+
+
+
+#define GL_GLEXT_PROTOTYPES
+#include <GLES2/gl2ext.h>
+
+#ifndef glGenVertexArrays
+#define glGenVertexArrays( n, arrays_ptr) { \
+			glGenVertexArraysOES( n, arrays_ptr); \
+		}
+#endif
+
+#ifndef glBindVertexArray
+#define glBindVertexArray( array_ptr) { \
+			glBindVertexArrayOES( array_ptr); \
+		}
+#endif
+
+ifndef glDrawBuffers
+define glDrawBuffers ( n, buffers_ptr) { \
+			glDrawBuffersEXT( n, bufs); \
+		}
+#endif
+
+
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+
+sarebbe ancora meglio wrappare tutto attorno a (o un test più sofisticato per dire GL4 o GLES3.1)
+#ifndef GL_ES_VERSION_3_1
+	...
+#endif