[OGUI-1453] Add context-menu with filtering and more general actions to ILG table cells

[isaachilly]

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• Right-Click Context Menu: Right-clicking a cell now brings up a context menu with four actions: two for additive/reductive filtering, and two field-independent actions ("Clear Filter" and "Copy").
• Opted to use a context menu over modifying the double-click functionality for two reasons:
  1. It avoids disrupting the likely learnt user behaviour of double-click to immediately open the inspector.
  2. Right-click is an intuitive, immediately reachable, and previously unused way to interact with ILG.
• Adds tests to validate context menu opening, closing and specific action functionalities.

[graduta]

Very nice context menu, good job!
Please see below a few comments and suggestions based on existing use and behaviour of ILG:

• I believe it would be good to display a hover pop-up when hovering that informs the user to right-click for more options
• the right click menu should also have the option to open the inspector
• match and exclude should append instead of replacing the filter. Currently Infologger for all fields except date accept:
  • for one world filters: multi-search by space separation. e.g. system box can accept "ECS GUI" and will search for OR
  • message filter (match/exclude) accepts searching by long messages and the OR is applied on new line separator
  • if we simply "replace" rather than append, shifters will lose existing filters and we do not want that as we give them a pre-defined configuration most of the time with messages to exclude for example
• severity and label columns should also update the toggle filter buttons

[isaachilly]

Very nice context menu, good job! Please see below a few comments and suggestions based on existing use and behaviour of ILG:

* I believe it would be good to display a hover pop-up when hovering that informs the user to right-click for more options

* the right click menu should also have the option to open the inspector

* match and exclude should append instead of replacing the filter. Currently Infologger for all fields except date accept:
  
  * for one world filters: multi-search by space separation. e.g. system box can accept "ECS GUI" and will search for OR
  * message filter (match/exclude) accepts searching by long messages and the OR is applied on new line separator
  * if we simply "replace" rather than append, shifters will lose existing filters and we do not want that as we give them a pre-defined configuration most of the time with messages to exclude for example

* severity and label columns should also update the toggle filter buttons

• What do you think about the level filtering? I've set it to have the options of either set level to the next lowest/highest mode.
• See my reply about the fixed positioning comment.
• I have not yet looked at PopoverEngine. When I started the ticket I specifically looked at similar CSS-wise components but they didn't map so well hence I wrote my some inspired purpose-built classes instead.
• Everything else mentioned I added as I understood.

[graduta]

Very nice progress! I believe there are two more issues that need addressing and then PR will be good to be shipped.

1. I did not see a reply or implementation to my suggestion on hover of cell so that the users are aware of the feature
2. It seems that a small bug is introduced where the separator line between the message column and one before is not there anymore (see screenshot)