Issue #121 - Add help text popover for command arguments

[bkseto]

This PR adds the ability for users to view command argument information by clicking on the info icon.

Examples:

• SEND_STR_ARG

• !Command name: SEND_STR_ARG opcode: 0x0005 subsystem: CMD title: Send string argument value desc: | This command tests sending a single string argument.

  arguments:

  • !Argument name: str_arg desc: String Argument units: none type: S16 bytes: [0,15]

    
    ![Screen Shot 2022-08-03 at 10 47 33 AM](https://user-images.githubusercontent.com/104385328/182675056-d145f50c-3253-455f-bf9f-3d646bf2a641.png)

• SEQ_ENABLE_DISABLE

• !Command name: SEQ_ENABLE_DISABLE opcode: 0x0003 subsystem: CMD title: Enable/Disable Sequence desc: | This command enables or disabled the specified sequence. If a sequence to be disabled is currently executing, it will be interrupted.

  arguments:

  • !Argument name: sequence_id desc: Sequence ID units: none type: MSB_U16 bytes: [0,1]

  • !Argument name: enable desc: Enable units: none type: U8 bytes: 2 enum: 0: DISABLED 1: ENABLED

    
    ![Screen Shot 2022-08-03 at 10 41 39 AM](https://user-images.githubusercontent.com/104385328/182674769-05a036e6-a613-443a-9c82-7cd9124d1860.png)
    ![Screen Shot 2022-08-03 at 10 41 46 AM](https://user-images.githubusercontent.com/104385328/182674791-fa85c3ec-3a34-45f7-a6b3-2eadbbd5bedf.png)

• CORE_SET_OP_MODE

• !Command name: CORE_SET_OP_MODE opcode: 0x0006 subsystem: CORE desc: | This command sets the operational mode.

  arguments:

  • !Argument name: mode desc: Mode units: none type: U8 bytes: 0 enum: 0: SAFE 1: IDLE 2: SCANNING 3: SCIENCE

    
    ![Screen Shot 2022-08-03 at 10 42 04 AM](https://user-images.githubusercontent.com/104385328/182674703-63f7d8df-3367-4856-97e9-04b5c37ba13f.png)

Note: Most of the popover implementation was borrowed from here.

Closes #121.