Parse f/F suffix on float literals

Add minimal limits.h

Create vacietis.libc.float.h package

Add an empty assert.h

Fix sizeof(TYPE) within an expression

Add a sizeof test

Expand macros in array declarations

c-read-delimited-strings: Remove skip-spaces? argument

Check if a variable is bound, instead of non-nil

Fix sizeof a string

Fix special/symbol-macrolet conflict

This fix avoid errors like the following:

Attempt to bind a special variable with SYMBOL-MACROLET: |exit_failure|

Ignore whitespace around macro call arguments

Fix backslash character literal handling

When *load-verbose*, print "done loading" messages

Handle inline comments on preprocessor lines

Add stub headers, limits.h and float.h

Support an empty macro on its own line

Add preprocessor-use-empty-define test

Add some libc headers

Declare vacietis::*environment*

This fixes a compiler warning.