main: Slight refactor of main. Improve color situation.

Several issues are addressed here:
- main() is large, and half of it is only used if we're not rasterisk;
  fixed by spliting up the daemon part into a separate function.
- Call ast_term_init from rasterisk as well.
- Remove duplicate code reading/writing asterisk history file.
- Attempt to tackle background color issues and color changes that
  occur. Tested by starting asterisk -c until the colors stopped
  changing at odd locations.

ASTERISK-25585 #close

Change-Id: Ib641a0964c59ef9fe6f59efa8ccb481a9580c52f

include/asterisk/term.h

@@ -63,7 +63,7 @@ extern "C" {
 /*@} */
 
 /*! \brief Maximum number of characters needed for a color escape sequence,
- *         plus a null char */
+ *         and another one for a trailing reset, plus a null char */
 #define AST_TERM_MAX_ESCAPE_CHARS   23
 
 char *term_color(char *outbuf, const char *inbuf, int fgcolor, int bgcolor, int maxout);