Add search bar and navigation to Notes tab

[Nostyxx]

Fixes #1670

Description of the problem being solved:

Implements a dedicated search bar and navigation buttons for the Notes tab.

Steps taken to verify a working solution:

Verified that searching matches text correctly across multiple lines.
Verified that the search correctly wraps around from bottom-to-top and top-to-bottom.
Verified that the search ignores all variations of PoB color codes.
Verified that navigation buttons and shortcuts correctly cycle through matches.

Before screenshot:

After screenshot:

[Blitz54]

Highlighting the text makes the rest of the line print in white too.
EDIT: Apparently that's an issue on current release. Would be nice to fix tho.

Also would be nice if clicking the search box would highlight the previously highlighted text, or at least the first one. Atm clicking the notes box, then the search box, will have nothing highlighted. So either need to add or subtract a letter, or press the next/previous button.

EDIT EDIT:

				local selWidth = DrawStringWidth(textHeight, self.font, sel)
				local r,g,b,a = GetDrawColor()
				SetDrawColor(self.selBGCol)
				DrawImage(nil, textX, textY, selWidth, textHeight)
				DrawString(textX, textY, "LEFT", textHeight, self.font, sel)
				SetDrawColor(r,g,b,a)

Making this change to lines 349-354 in EditControl seems to work.

[Nostyxx]

@Blitz54 Much appreciated for the help! Fixed.