textScaleFactorを変更できるように

[poppingmoon]

Fix #219

アプリ全体のtextScaleFactorを変更できるようにしました

• 全般設定画面からスライダーで設定できるようにしています
  • とりあえず 50% から 150% の10段階にしました
• 実際には MediaQuery.textScaleFactorOf(context) と設定した倍率をかけたものを渡しています

[codecov-commenter]

Codecov Report

Merging #220 (94d0b29) into master (78fc98a) will increase coverage by 0.02%.
Report is 1 commits behind head on master.
The diff coverage is 72.27%.

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@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
+ Coverage   24.66%   24.68%   +0.02%     
==========================================
  Files         200      200              
  Lines        9212     9236      +24     
==========================================
+ Hits         2272     2280       +8     
- Misses       6940     6956      +16     

Files Changed	Coverage Δ
lib/model/general_settings.dart	0.00% <ø> (ø)
lib/model/general_settings.g.dart	0.00% <0.00%> (ø)
...e/general_settings_page/general_settings_page.dart	0.62% <0.00%> (-0.07%)	⬇️
lib/view/themes/app_theme_scope.dart	94.77% <98.64%> (+0.93%)	⬆️

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[shiosyakeyakini-info]

マージしました！ありがとうございます！