[FAB-135] Participant control

[daystram]

• Kick participants
• Clear controller layer
• LayerToolbar readability

[nicolauscg]

changes looks good, I tested on localhost for the new feats this PR and ur tool improvements PR, reviewed changes line by line for this one too.

to confirm ws flow

• for clear: hub sends ws msg which BE will broadcast to student's canvas and hub layer for that role
• for kick: hub sends ws msg then BE will dc that student? if so, we can put some text on ws flow confluence page so others may be aware of this

2 minor stuff for discussion

• do we want color tool tooltip to be 1 or 2 rows? concerned of a possbile overflow if 1 row
• looks like tooltip border for both hub and student tools is hard to see when canvas is also white, do we want to try adding like a black border?

[daystram]

Both new WS flow appears correct, will update docs. We can have 2 rows for the colour palette and add a thin border to the tooltip.

[sonarcloud]

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0.0% Duplication

[nicolauscg]

all good!