Implement dialogs to edit valueColors for 2 multiColorDots plot types

#59 (closed)

Implement MultiColorDotDialog which is a subclass of EditValueColorDialog to be super class for the 2 following class:

• MultiColorDotLowerEqualDialog is implemented to edit value for multiColorDotsEqualOnLowerBound plot type.
• MultiColorDotUpperEqualDialog is implemented to edit value for multiColorDotsEqualOnUpperBound plot type.

assigned to @ldam

added 9 commits

• 88fedfb3...6dde416e - 8 commits from branch master
• d01dfc32 - Merge branch 'master' into i69_edit_value_color_for_multiColorDots

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changed the description

added 5 commits

• d01dfc32...6084c373 - 4 commits from branch master
• 94a34e94 - Merge branch 'master' into i69_edit_value_color_for_multiColorDots

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requested review from @kienle

added 3 commits

• 73dc7b84 - multi_color_dot_dialog: change TOTAL to ROW_TOTAL; add message when editing...
• 7e6ff0d0 - remove setting changed_rowid to None when include check box is checked because...
• 761cc38f - docstring, move common codes in the subclasses to superclass

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resolved all threads

added 4 commits

• f214b0e0 - adjust last row; rearrange add_row() to be more readable
• 2d5affef - change rowid to row_id
• a01f48c8 - trivial modify for type hint and variable name
• a6b174b8 - move detail's comment to code

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