implement a whole bunch of Forth words, most notably "if"

we decided to do flow control in a fun suffix-y way. so we introduced words { and } which track code blocks while compiling them, and the new word "if" uses memmove to slide that block around to insert a branch before it.

memmove is also new, implemented in flatassembler

also "if" relies on "'" which itself wants to be able to quote the word "lit", so the flatassembler word "literal" is introduced to break the cycle

Force-Push: yes
Change-Id: Iff17a15a1e748fe536e73ad05b1d4b06725a9f78

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