Module for designing keyboard layouts

Changes for 0.77

• Better comments (in the output .klc) about the purpose of KEYNAMES etc. Better comments (in the output .klc) about the restrictions on (the minimal possible) SHIFTSTATE. Correct 2 POD errors. Clarify a bit the description of radio-buttons in FE keyboards. Document how to generate different VK-codes depending on modifiers. Change (the only) ;-comment in the generated .kbdd file to //. Warn about conflict of assigned via VK scancodes. Allow multiple assigned-to-VK scancodes (separate by |); the main one (if binds) is the last one. Document the VK-subsection. Bogus “unreached”: —  𐋠 𐋳 𐋴 𐋵 𐋶 𐋷 𐋸 𐋹 𐋺 𐋻 On Windows, allow more than one ≥0x10000 codepoint in the source of a prefix key map, and explain the limitation for the target. Attept to: allow undefing keys via DefinedTo[undef]. Writes its version (as a comment) into the resulting file. Update the builtin — and only so far — tables of key names. (fixing the errors of MSKLC). Document these errors. We erronerously updated the list of scancodes in a setting in VK-section. Try not-updating the rest as well. New undocumented method 'literal' in ComposeKey. (Undocumented, splits by |||.)
• examples/klc2c.pl The comment about KBDEXT in the generated table of scancodes seems to be wrong (by inspecting RSHIFT). Better comments about the purpose of aKeyNames etc. Uses its version and the version of the module as the 4th and the 3rd numbers in the version id.
• examples/klc-layout2human.pl New file (converts the LAYOUT section to a human-readable — and still parsable — form). (Can also be used for checking for hanging ligatures.) Replace end by … if too long; put in ⟬⟭ and replace whitespace by ␣, double-slash by ⁄⁄ if the context may confuse the parser. (Still wrong for ‌ ‍ ͏ ‎ ‏ = 034f 200c–200f Combining Grapheme Joiner (CGJ), ZERO WIDTH (NON-)JOINER, L2R/R2L-marks)
• izKeys.kbdd: In comments, KANA was wrongly identified as scancode=50 (should be 70). Remap scancodes 61, 72, 74 to VK-codes SNAPSHOT, OEM_AX (=“our-Menu”=“our-APPS”) and APP. (To allow remapping.) Change assignment of Emaji from Id() to Layers() — but only for AltGr-Menu, since "Add_AltGr" is A LAYER. Does not change the output layout — but changes “Unreachable” warnings (wrongly!)… UNDO??? Warnings are correct only if the binding is put into Layer 1 ??? (It would be lowered automatically by the logic of the assigner-to-an-extra-layer prefixNOTSAME=****.) Same for Green1pref. Assignment of Dashes/Spaces crept in to Add_Menu. (Now Menu-F12 are not Compose.) Undef the F-key bindings in lAlt-lCtrl. Move coptic hundreds to F-keys in Menu-rCtrl (Hebrew). Add objectified emoji to Double-Struck F-keys. Deliver 4th personality (as opposed to Hebrew) on Menu-rCtrl. Undo addition of length=5 emojis (XXXX Were trying to bisect a defect in RU: no/bad access to AltGr-Mnu; but it was unrelated. Still undone!) chainAltGr: insert Hebrew, make the same everywhere, terminate by ⤨. Terminate the Compose chain by ⎄.