feat: improve colored output

[Davincible]

Continuation of #24

[Davincible]

I've added more coloring for testify output, the extra coloring is nice but I'm not sure about the colors themselves yet. Open to suggestions

[Davincible]

Panic highlight:

[akinsho]

This generally looks good to me. I've made a few comments about using builtin helper functions instead of custom ones and some other suggestions/questions

[akinsho]

Should these come from a user's config, but default to these values to start, so they can be easily overridden?

[Davincible]

Yes. What do you think would be the best behavior here;

1. if a user specifies a custom pattern, replace all patterns with the users' patterns
2. if a user specifies a custom pattern, add on to default patterns, and overwrite the default pattern if they have the same name

[akinsho]

@Davincible I think in most cases plugin authors use vim.tbl_deep_extend i.e. we only ever replace something that has been specifically changed by the user so essentially option 2

[Davincible]

Changed to built-in functions. Didn't know about them

[Davincible]

There are two small bugs I'm not sure how to resolve;

1. if a panic occurs and the goroutine number is 19, this artifact occurs
2. sometimes patterns get overwritten by others, here the bytes after the file number are uncolored. This happens randomly. This is because color patterns in the table are unordered, which is fine, but even though all patterns should get applied to the same line, they somehow don't.

Edit:
Nr. 1 happens because it does a 'replace all' on the number 19, which happens to be also contained in the color codes. Thus currently a pattern like <red>ABC</red> <green>ABC</green> wouldn't work because all occurrences would be colored green