Word highlighting, lsp_signature, calendar and settings / keybindings

Plugins:

- added word highlighting plugin mywords
- added lsp_signature plugin to show parameter signature while typing a
  function call
- added calendar.vim
- added lush.nvim needed for some theme definitions, though not for the
  nice and current default lunaperche

Keybindings:

- <space>m[mrc] for mywords
- <C-W>0 and <C-W>1 for window close / make single
- <C-,> for lsp references
- <C-.> for lsp definitions

Options:

- highlight last search term
- add I to shortmess to start with an empty file instead of splash
  screen
- fzf uses default-title as theme
- fzf registered as vim.ui.select implementation
- which_key shows global definitions, too

lua/lsp.lua

@@ -25,8 +25,9 @@ require('mason-lspconfig').setup({
 -- Customized on_attach function
 -- See `:help vim.diagnostic.*` for documentation on any of the below functions
 local opts = { noremap = true, silent = true }
-vim.keymap.set('n', '<space>e', vim.diagnostic.open_float, opts)
-vim.keymap.set('n', '<space>q', vim.diagnostic.setloclist, opts)
+vim.keymap.set('n', '<space>e', vim.diagnostic.open_float, { noremap = true, silent = true, desc = "Popup diagnostics" })
+-- 2024-09-23 - currently unused
+-- vim.keymap.set('n', '<space>q', vim.diagnostic.setloclist, opts)
 vim.keymap.set('n', '[d', vim.diagnostic.goto_prev, opts)
 vim.keymap.set('n', ']d', vim.diagnostic.goto_next, opts)
 
@@ -58,13 +59,13 @@ local on_attach = function(client, bufnr)
   -- 2024-09-09 - some ccflow commands
 
   local fzf = require('fzf-lua')
-  vim.keymap.set('n', '<space>d', fzf.diagnostics_document, { desc = "Doc diagnostics" })
+  vim.keymap.set('n', '<space>d', fzf.diagnostics_document, { desc = "Document diagnostics" })
   vim.keymap.set('n', '<space>D', fzf.diagnostics_workspace, { desc = "Workspace diagnostics" })
   vim.keymap.set('n', '<space>s', fzf.lsp_document_symbols, { desc = "Doc symbols" })
   vim.keymap.set('n', '<space>c', fzf.lsp_code_actions, { desc = "Code Actions" })
   -- vim.keymap.set('n', 'gr', vim.lsp.buf.references, bufopts)
-  vim.keymap.set('n', '<C-[>', fzf.lsp_references, { desc = "Find References" })
-  vim.keymap.set('n', '<C-]>', fzf.lsp_definitions, { desc = "Find References" })
+  vim.keymap.set('n', '<C-,>', fzf.lsp_references, { desc = "Find References" })
+  vim.keymap.set('n', '<C-.>', fzf.lsp_definitions, { desc = "Find References" })
 end
 
 -- Set different settings for different languages' LSP