Use double quotes ("). They can be interspersed with
other whitespace characters, just like shell quoting.
A backslash (\) always escapes the next character.
The end of the stream always terminates the word.
Add AutoText struct to unit test utilities, to easily
make spv_text_t values and reference them as spv_text values.
- a single hyphen is a string, not a number.
- a string with more than one period is a string, not a number
- check for string overflow
Add some unit tests
Since now we can distinguish between def and use according to
the variable's location, there is no need to keep two variable
prefixes.
Also reformat tests to use the value generating instruction
format ("<result-id> = <opcode> <operand>..").
Fix the bug that TextAdvance() forgot to skip whitespace at the
beginning of the next line after a comment line.
Fix the bug that TextAdvanceLine() increase line number after going
over a character.
For enum Capability and enum Op, not all newly added enumerants are
registered into capabilityInfoEntries and opcodeTableEntries yet.
That will come in following commits.
