Simplify Glyph

[madig]

Closes #92.

I'm keeping Outline around for only-once checking. Maybe... I can cut down the builders again and get the only-once logic back into the glif parser...

[github-actions]

🗜 Bloat check ⚖️

Comparing 5940ed2 against 2233ab4

target	old size	new size	difference
target/release/examples/open_ufo	1.75 MB	1.75 MB	856 Bytes (0.05%)
target/debug/examples/open_ufo	7.15 MB	7.15 MB	-824 Bytes (-0.01%)

[github-actions]

🗜 Bloat check ⚖️

Comparing df437e2 against ecd03ad

target	old size	new size	difference
target/release/examples/open_ufo	1.75 MB	1.77 MB	20.34 KB (1.13%)
target/debug/examples/open_ufo	7.15 MB	7.15 MB	-784 Bytes (-0.01%)

[madig]

I am now looking at de-Option-ing the libs of Anchor, Guideline, Contour, ContourPoint and Component. There, we have the added headache of identifiers. The replace_lib method takes care to assign an identifier.. but what if we don't have an Option to guide us? Auto-as# lib_mut even when nothing is added?

[cmyr]

Is the option in these types a big problem, ergonomics-wise? I think that creating an identifier on access is reasonable, it's sort of like 'copy on write' semantics.

[madig]

Since there doesn't seem to be much code accessing those libs, I can't say, it is very slightly annoying when you have to, though. Maybe I'll leave it for now... I'll have to think about this more.

[github-actions]

🗜 Bloat check ⚖️

Comparing a7f1555 against 75ffac0

target	old size	new size	difference
target/release/examples/open_ufo	1.75 MB	1.77 MB	19.21 KB (1.07%)
target/debug/examples/open_ufo	7.15 MB	7.15 MB	-1.43 KB (-0.02%)

[madig]

I wonder why a release build is bigger now 🤔

[cmyr]

One little note, otherwise this looks good to me!

[github-actions]

🗜 Bloat check ⚖️

Comparing 12e2341 against 75ffac0

target	old size	new size	difference
target/release/examples/open_ufo	1.75 MB	1.77 MB	19.2 KB (1.07%)
target/debug/examples/open_ufo	7.15 MB	7.15 MB	-1.47 KB (-0.02%)

[github-actions]

🗜 Bloat check ⚖️

Comparing ccc7770 against 75ffac0

target	old size	new size	difference
target/release/examples/open_ufo	1.75 MB	1.77 MB	18.8 KB (1.05%)
target/debug/examples/open_ufo	7.15 MB	7.15 MB	-2.22 KB (-0.03%)