Continue compilation for as long as possible

[rexim]

@yui-915 @deniska @mikmart @Miezekatze64 Please let me know what you think about this? Do you notice any UX problems?

[yui-915]

doesn't try to "guess" the developer intentions and report nonsense errors (rust), which is good!

[mikmart]

I like it!

I tried to see how many errors I can get in a file, but it's surprisingly hard to not end up with some unrecoverable errors that abort compilation 😄 I often ended up with a bunch of these recoverable errors and ending with a non-recoverable one.

One thing I'd maybe add is to always show the error count when compilation is aborted, even if we didn't reach the end of the compilation. For example I ended up with output like this often:

$ build/b tests/goto.b
tests/goto.b:6:8: ERROR: expected `(`, but got identifier
tests/goto.b:6:14: ERROR: expected `)`, but got `{`
tests/goto.b:9:14: ERROR: label `en` used but not defined
tests/goto.b:11:5: ERROR: expected identifier, but got keyword `goto`

But only got to see the error count if I only had recoverable errors like this:

$ build/b tests/goto.b
tests/goto.b:6:15: ERROR: expected `)`, but got `{`
tests/goto.b:8:5: ERROR: expected `;`, but got `}`
tests/goto.b:9:14: ERROR: label `en` used but not defined
tests/goto.b:11:10: ERROR: label `loo` used but not defined
4 errors encountered

[nullnominal]

LEXER ERROR: Character literal contains more than two characters can probably be ignored

[rexim]

Thank you everyone for your feedback!