Before this patch the TOML parser would incorrect treat the string
"base64data0xdamaged" in a declaration as a hex number because the
corresponding check triggers even when the "0x" is inside a double
quoted string literal as long as it is followed by at least one hex
character.
For some reason, the unit tests for Deno.remove() were not being imported to
unit_tests.ts and, consequently, not being executed. Thus, I imported them,
refactored some existent ones and wrote new ones for the symlink removal case.
Since the creation of a symlink is not implemented for Windows yet, assertions
that consider this state were added when the tests are executed in this OS.
