Define a multiline separator
WIP: Bunch out output around a multiline parser
Split TRIM_STRING into LTRIMS_STRING and RTRIM_STRING
Whitespace trim before I start hacking.
ConfigSettings::[start|end]Code are now std::string
Config support for multiline strings.

Multiline strings are started with """
and continue until a line contains only """ at the beginning

For example:

```
# Start and End gcode
startCode = """
; This is coming from the config
"""

endCode = """
;     such end code
;

; very wow
"""
```
No need for iostream, I guess.
Merge pull request #56 from sshirokov/multiline-config

Multiline configuration values