MAJOR: Project rename and preparation for v1.0.0

I hope I haven't missed any for the renames!

lua/outline/providers/init.lua

@@ -0,0 +1,38 @@
+local M = {}
+
+local providers = {
+  'outline/providers/nvim-lsp',
+  'outline/providers/coc',
+  'outline/providers/markdown',
+}
+
+_G._symbols_outline_current_provider = nil
+
+function M.has_provider()
+  local ret = false
+  for _, value in ipairs(providers) do
+    local provider = require(value)
+    if provider.should_use_provider(0) then
+      ret = true
+      break
+    end
+  end
+  return ret
+end
+
+---@param on_symbols function
+---@return boolean found_provider
+function M.request_symbols(on_symbols, opts)
+  for _, value in ipairs(providers) do
+    local provider = require(value)
+    if provider.should_use_provider(0) then
+      _G._symbols_outline_current_provider = provider
+      _G._symbols_outline_current_provider.name = value
+      provider.request_symbols(on_symbols, opts)
+      return true
+    end
+  end
+  return false
+end
+
+return M