Pattern language offset and other crash fixes

Changelog

Addition

• Added alpha preview to the color picker tool

Improvements

• Improved display of the base address setter popup
• Make std::mem::find_sequence_in_range return -1 when the value couldn't be found

Bug Fixes

• Fixed bug where the current offset in the pattern runtime was getting messed up when calling a function
• Fixed a crash when entering too much text in various input text boxes
• Fixed a crash when searching for empty strings or bytes

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