[v2.1.0] Added preset avatars and the bucket tool

Thank you for using VRoid Studio. VRoid Studio v2.1.0 update concerns the following: ■ New features [list] [*] Added avatar presets (AvatarSample) from D to Z [*] Added a Bucket tool to the texture editor [*] Added shortcut keys for the bucket tool and blur tool [list] [*] Bucket:G [*] Blur:R [*] Fill Opacity:Shift + [ ] [/list][/list] We will keep looking out for your comments and feedback and work towards new updates. Thank you for your continued support. ▼VRoidPreset_A - Z [url=https://vroid.pixiv.help/hc/en-us/articles/4402394424089]https://vroid.pixiv.help/hc/en-us/articles/4402394424089[/url] ▼How to use the Texture Editor [url=https://vroid.pixiv.help/hc/en-us/articles/4405430561817]https://vroid.pixiv.help/hc/en-us/articles/4405430561817[/url] ▼I want to learn more about keyboard shortcuts in VRoid Studio for Windows and macOS [url=https://vroid.pixiv.help/hc/en-us/articles/900006050066]https://vroid.pixiv.help/hc/en-us/articles/900006050066[/url]