Optimize arch depths of Armenian letters.

[jmcwilliams403]

Compound letters now have arch depths that respect taking up only half a character cell under monospace.
Also some capital letters now use g4 x [mix top bot (ArchDepth{A|B}/(ArchDepthA + ArchDepthB))] instead of flatside which makes them more consistently rounded under condensed width, instead of only sometimes flattening out.
Also some miscellaneous other fixes related to ArchDepth that are somewhat difficult to explain/articulate.

If Հ/Ց/Ֆ/ֆ look problematic in the images below, then just ignore them; I fixed them in a second commit.

 ԱԲԳԴԵԶԷԸԹԺԻԼԽԾԿ
ՀՁՂՃՄՅՆՇՈՉՊՋՌՍՎՏ
ՐՑՒՓՔՕՖ  ՙ՚՛՜՝՞◌՟
ՠաբգդեզէըթժիլխծկ
հձղճմյնշոչպջռսվտ
րցւփքօֆևֈ։֊  ֍֎֏

Sans Monospace Thin Upright:

Sans Monospace Regular Upright:

Sans Monospace Heavy Upright:

Sans Monospace Thin Italic:

Sans Monospace Regular Italic:

Sans Monospace Heavy Italic:

Slab Monospace Thin Upright:

Slab Monospace Regular Upright:

Slab Monospace Heavy Upright:

Slab Monospace Thin Italic:

Slab Monospace Regular Italic:

Slab Monospace Heavy Italic:

Aile Thin Upright:

Aile Regular Upright:

Aile Heavy Upright:

Aile Thin Italic:

Aile Regular Italic:

Aile Heavy Italic:

Etoile Thin Upright:

Etoile Regular Upright:

Etoile Heavy Upright:

Etoile Thin Italic:

Etoile Regular Italic:

Etoile Heavy Italic: