Flatten repo layout, drop nested HideCoAUI subfolder

The addon folder is now the repo root, so installers rename the
extracted archive to HideCoAUI instead of finding a subfolder already
named that.

SlashCommands.lua

@@ -0,0 +1,38 @@
+local commands = {}
+
+local function RegisterCommand(name, description, handler)
+    table.insert(commands, { name = name, description = description, handler = handler })
+end
+
+HideCoAUI.RegisterSlashCommand = RegisterCommand
+
+local function PrintCommandList()
+    print("|cff33ff99HideCoAUI|r commands:")
+    for _, command in ipairs(commands) do
+        print("  |cffffffff/hidecoaui " .. command.name .. "|r - " .. command.description)
+    end
+end
+
+local function HandleSlashCommand(msg)
+
+    local commandName = msg:match("^%s*(%S*)"):lower()
+
+    if commandName == "" then
+        HideCoAUI.OpenOptions()
+        return
+    end
+
+    for _, command in ipairs(commands) do
+        if command.name == commandName then
+            command.handler()
+            return
+        end
+    end
+
+    print("|cff33ff99HideCoAUI|r unknown command: /hidecoaui " .. commandName)
+    PrintCommandList()
+
+end
+
+SLASH_HIDECOAUI1 = "/hidecoaui"
+SlashCmdList["HIDECOAUI"] = HandleSlashCommand