major main.c refactoring

- now takes command line arguments:
Usage: ./bin/cosmo [-clsr] [args]

available options are:
-c <in> <out>   compile <in> and dump to <out>
-l <in>         load dump from <in>
-s <in...>              compile and run <in...> script(s)
-r                      start the repl

Makefile

@@ -1,8 +1,8 @@
 # make clean && make && ./bin/cosmo
 
 CC=clang
-CFLAGS=-fPIE -Wall -O0 -Isrc -std=c99 -g
-LDFLAGS=-lm -fsanitize=address
+CFLAGS=-fPIE -Wall -O3 -Isrc -std=c99
+LDFLAGS=-lm #-fsanitize=address
 OUT=bin/cosmo
 
 CHDR=\