improve frontend of emacs, ckeditor, tinymce, nicedit, meta and env functions

Improves in emacs:
- use htmx to send content to the controller
- show txt and formatted_txt content in the second panel
- show two tabs if "tabs" winix parameter is used
- add an option to show either one or two panels
- correctly resize the editor window (F11) when two panels are shown

Improves in ckeditor:
- use htmx to send content to the controller
- do not check automatically for ckeditor update

Improves in tinymce/nicedit/meta/env:
- use htmx to send content to the controller

while here:
- change PascalCase to snake_case in meta/env controllers
- update CodeMirror editor to 5.65.16
- udpate Showdown (markdown to html converter) to 2.1.0

winixd/html/fun_env.html

@@ -62,13 +62,30 @@
 	
 	<input type="hidden" name="userid" value="[env_user.user.id]">
 
-	<div class="uk-margin">
-		<input class="uk-button uk-button-primary" type="submit" value="{change}">
-	</div>
+	<div class="uk-margin winix-env-status">
+		[frame "env"]
 
-	[if winix_function_param_is "postredirect"]
-		<input type="hidden" name="postredirect" value="[winix_function_param_value "postredirect"]">
-	[end]
+			[if winix_function_param_is "postredirect"]
+				<input type="hidden" name="postredirect" value="[winix_function_param_value "postredirect"]">
+			[end]
+		
+			<div class="uk-margin-medium">
+				<button
+					class="uk-button uk-button-primary uk-width-1-1 uk-width-1-2@s uk-width-1-3@m wx-button-spinner"
+					type="submit"
+					hx-on:click="event.preventDefault(); winix_update_from_codemirror(this, '[doc_base_url][dir][if request.is_item][item.url]/[end]env[if winix_function_param_is "a"]/a[end]/frame:env', '.winix-env-status')"
+				>
+					<span class="wx-button-spinner-text">
+						[if request.is_item]{change}[else]{add}[end]
+					</span>
+					<div class="wx-button-spinner-spinner">
+						<div uk-spinner="ratio: 0.5"></div>
+					</div>
+				</button>
+			</div>
+				
+		[end]
+	</div>
 
 </form>