Merge pull request #56 from chchwy/master

Feature: Custom keyboard shortcuts
Solved issue of cursor not updating after resized
Merge pull request #57 from eVoLuTiVeMEDIA/solving-cursor-size-refresh

Solved issue of cursor not updating after resized
create develop branch

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PencilSetting: delete all shortcuts settings before restore default shortcuts.

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ShortcutsPage: 1. empty lineEdit when shortcuts conflict. 2. fix typo.

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missing file of last commit :/

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ToolSet: ready to remove all changeXXXButton(), merge into methods xxxOn()

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MainWindow2: 1. reconnect Tool's menu action to right slots.
2. rename Editor::clear_clicked() to Editor::clearCurrentFrame()
3. rename Toolset::clearClick() to ToolSet::clearButtonClicked()

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BaseTool: move enum ToolType to pencildef.h

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ToolSet: 1. fix Pen width at 2px. 2. add slot setCurrentTool(ToolType)

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Editor: remove all xxx_clicked() method, replace with Editor::setTool(ToolType)
2. add slot resetView()

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minor

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minor

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ToolSet: remove all unused changeXXXButon() methods after refactoring.

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ToolSet: remove unused method

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