RTL issues

[Malvoz]

dir="rtl" issues observed in https://maps4html.org/experiments/i18n/rtl/:

• Context menu:
  • menu items not aligned right-to-left
    (fixed in Inherit text-align in .mapml-button #506)
  • keyboard shortcut annotations on wrong side
    (not true if the text is in an actual RTL script)
  • submenu generally opens on the wrong side
• Layer control:
  • Remove layer button on wrong side
    (fixed in Refactoring HTML anatomy of items in layers #531)
  • input controls inside .mapml-control-layers don't have the appropriate margin due to physical left value
    (fixed in Alignment improvements in the Layer control #565: c95d4e3)
• Tooltips (upstream: Direction RTL Tooltip Leaflet/Leaflet#7201):
  • offset/incorrect position
  • arrow on tooltips is on the wrong side

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Related issue: #495.