improved expr and named params

- splited code parser code into 2 units
- added parameter print grbl command via $#= (similar to grblHAL)
- modified float argument parsing with expressions enabled
- completed named params results

Author: Paciente8159

uCNC/cnc_config.h

@@ -289,7 +289,7 @@ extern "C"
 	 * processes comment as defined in the RS274NGC
 	 * */
 
-// #define PROCESS_COMMENTS
+#define PROCESS_COMMENTS
 
 	/**
 	 * Enables RS274NGC canned cycles
@@ -306,7 +306,7 @@ extern "C"
 	/**
 	 * Enables RS274NGC expression parsing
 	 * **/
-// #define ENABLE_RS274NGC_EXPRESSIONS
+#define ENABLE_RS274NGC_EXPRESSIONS
 #ifdef ENABLE_RS274NGC_EXPRESSIONS
 	// Uncomment to enable named parameters
 #define ENABLE_NAMED_PARAMETERS