Several small changes
Common splitted to h and c files
Lexer splitted to h and c files
Moved define devel to logging.h
Parser splitted to h and c files
Removed run file
Updated Readme
Loop checking of stop-characters
Lexer refactored
TokensStream renamed to TokenStream
Created lexer texts
Created common.c tests
Fixed isDigit reaction on empty str
Files with tests renamed to test_FILENAME.c
Defines for node types
Refactored fillOpTable
Hashatble split to h and c files
Buily-in's and execution related functions are moved out of main
Lite cleaning of parser
Removed reduntant token null checking from parse