Merge pull request sakura-editor#1316 from KENCHjp/release/v2.4.1-fork

Release/v2.4.1

Merge pull request sakura-editor#1310 from KENCHjp/release/v2.4.1-bet…

…a3-fork

マージしまーす。

Merge pull request sakura-editor#1282 from beru/release/v2.4.1-beta2-…

…fork

v2.4.1 beta2 リリース準備

Merge pull request sakura-editor#1226 from KENCHjp/release/v2.4.0-fork3

Release/v2.4.0

Merge pull request sakura-editor#1216 from KENCHjp/release/v2.4.0-bet…

…a5-fork

Beta5 Release.

Merge pull request sakura-editor#1197 from KENCHjp/release/v2.4.0-bet…

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Release/v2.4.0 beta4

Merge pull request sakura-editor#1117 from KENCHjp/release/v2.4.0-beta3

Beta3リリース用修正

Merge pull request sakura-editor#1096 from KENCHjp/release/v2.4.0-bet…

…a-prepare

ベータ２リリース用ヘルプ修正

Merge pull request sakura-editor#1075 from KENCHjp/release/v2.4.0-bet…

…a-prepare

Release/v2.4.0 beta prepare

Merge pull request sakura-editor#814 from takke/release/v2.4.0-alpha1…

…-prepare

v2.4.0 alpha1 リリース準備