Preprocessor update

- macro processor: fix bug where command line arguments that began with an integer were being treated as integers even if they weren't (e.g. dates)
- macro processor: allow colon-separated arrays as command-line defines
- use prefix notation `R"()"` for quote in quotes

preprocessor @ 523e6bd0

-Subproject commit 1d31e00b818708a9f895e0b20e43cc8a83acc2ce
+Subproject commit 523e6bd0097dc948e704bac4dc24112a0639ca70