Simplify UX for combat defense

[phylll]

Selecting the right token and defense script, at least for the GM, is still more of a hassle than necessary. With MMM 1.26+, a more seamless experience should be possible in which attack scripts would end with notifying the target's player and offering a tailored selection of available (and permissible, in terms of Midgard rules) defense options already tied to the target token.

Better flow:

• Player/GM calls attack macro (attack entry point), which is/hands over to a
• weapon selector:
  • if there is only one weapon: generate config details, and call the attack processor (main combat script) (dynamically calling a script that uses @{target|...} or ?{...} to collect user input does not work via !mmm chat: %{sheet|ability}`)
  • if there are several weapons: output weapons selection menu to chat (which allows the player to call the attack processor for the weapon of choice), filtered -- in case of defense weapons -- by applicability since some defensive weapons work only against certain offensive weapon types.
    • For standard weapons, it is enough to hand over the weapon label; the attack processor will automatically pull other required properties.
    • For non-standard weapons, players need to have created config scripts. For the weapon selector to send the button click to that script, it checks if there is an attribute m3mgd_configCall_[weaponLabel] (w/o the brackets, weaponLabel can contain spaces!) and uses it for the script call; if that attribute does not exist, it asks the user & creates it.
• attack processor:
  • collect attack modifiers & execute.

[phylll]

Roll20 chat buttons with parameters are possible, with brackets HTML-encoded:

[PRESS](!mmm do myFunction("foo",1))

Encapsulating entire script or, perhaps more sensibly, customize blocks is also possible. This code ...

[DEFEND](!mmm customize
!mmm set cOwnID="Yorric MacRathgar"
!mmm end customize
%{MacroSheet|defense})

... produces this to be executed upon a click on the button:

!mmm customize
!mmm set cOwnID="Yorric MacRathgar"
!mmm end customize
%{MacroSheet|defense}

[phylll]

Closed via https://github.com/michael-buschbeck/mychs-macro-magic/pull/188