Versatile Text Length for the `format` directive

[SBird1337]

Allows to specify the maximal text width (in pixels) to the format directive granted the font id was specified as the second argument.

Example as taken from the README:

text MyText {
    format("Hello, are you the real-live legendary {PLAYER} that everyone talks about?\pAmazing!\pSo glad to meet you!", "1_latin", 100)
}

Becomes:

.string "Hello, are you the\n"
.string "real-live\l"
.string "legendary\l"
.string "{PLAYER} that\l"
.string "everyone talks\l"
.string "about?\p"
.string "Amazing!\p"
.string "So glad to meet\n"
.string "you!$"

[codecov-commenter]

Codecov Report

Merging #31 into master will increase coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
+ Coverage   92.17%   92.25%   +0.07%     
==========================================
  Files           6        6              
  Lines        1981     2000      +19     
==========================================
+ Hits         1826     1845      +19     
  Misses         98       98              
  Partials       57       57              

Impacted Files	Coverage Δ
parser/parser.go	90.48% <100.00%> (+0.17%)	:arrow_up:

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[SBird1337]

I added the remaining test cases to test for errors in the new diff, this should be ready now - I can squash the history if you want :>