Track Inspector and HeDaMixer updates

Track Inspector updates:

* v1.4rc6 (2019-04-23)
  # fix track icon and I/O icon

* v1.4rc5 (2019-04-19)
  # fix: delay button, clicking first time didn't set value
  # Left mouse click gain number to set gain without opening the I/O window, Right click to offset gain
  + I/O button on general panel to open I/O window
* v1.4rc4 (2019-04-19)
  # fix: optimization on initialization.
  # lock hidden track
  # fix: overlaps in sends panel on some cases
  # mute buttons for sends
  # fix: click on send gain number to set gain by entering the number
  # fix: pan labels as buttons to specify panning by entering number -100 to 100

* v1.4rc3 (2019-04-11)
  # fix: support different image sizes for themes
  # fix: retain theme changes without having to save theme.
  # change: polarity button to themable image.
  # change: moved track icon to name panel
  # change: moved auto enlarge selected track and auto show automation buttons to the general panel next to the height control buttons
  # fix: better autoenlarge selected tracks refresh
  # fix: align positive db number with negative numbers
  # change: Delay panel: Lmb to specify delay in ms. Right click to display preset menu. Alt+Click to remove preset.
  # change: Pan label 100%L renamed to L. 100%R renamed to R

* v1.4rc2 (2019-04-06)
  # fix freeze panel height and font if frozen
  # fix mark as disabled delay panel if Track FX bypass
  # fix adjust position db scale numbers

HeDaMixer updates:

* v2.0pre7 (2019-04-24)
  + Reorder tabs (right click menu on the tab to move left or right)
  # removed the default tab "1"
  # fix: Make sure proper version (VST3 or VST2) of dpmeter3 is used.
  # lock hidden tracks
  # fit window to tracks when starting HeDaMixer VIP (autolock selected tracks on start)
  # fix show IL number option
  + show IL scale suffix option