Frozen track made visible

[Gianfini]

Hi, this is really needed to make freezing tracks massively useful.

When freezing a track totally or up to a certain FX, I'd like to have a visual indication that that very track has frozen FX inside (that I could unfreeze and modify).

SOLUTION BASIC: just have the FX Insert ICON modified when track is totally / partially frozen. On Walter that would just mean introducing
- mcp_fx_norm_freeze
- mcp_fx_empty_freeze
- mcp_fx_dix_freeze

and correnspondent tcp ones

BETTER SOLUTION: all basic solution + with mouse-over on fx icon it should indicate also the names of FXs in frozen status (with different color or strikethrough font). Example

- ReaEq <-- this is frozen
- ReaComp <-- this is frozen
- Reafir <-- this is an active insert (as now for mouseover)
- (ReaDelay) <-- this is a bypassed insert (as now)

Clearly when the frozen status get lost (for example by heavily editing the item), all frozen indication would return to normal (non frozen) status


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