Fastfetch: adds interactive --gen-config mode

removes `--gen-config-*` flags (merged into `--gen-config`)

src/common/ffdata.h

@@ -19,4 +19,5 @@ typedef struct FFdata {
     FFstrbuf genConfigPath;      // Path to generate configuration file
     FFDataResultDocType docType; // Type of result document
     bool configLoaded;
+    bool genConfigInteractive; // `--gen-config` entered the interactive CUI
 } FFdata;

src/common/genconfig.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#include "common/ffdata.h"
+
+// Runs the interactive config generation CUI.
+//
+// On success (the user saved the config), it sets `data->structure` to the user chosen
+// module structure and `instance.config.logo.type` to the user chosen logo type, creates
+// the result document and returns true. The caller is expected to call `writeConfigFile`.
+// Returns false if the user quits without saving.
+bool ffGenConfigInteractive(FFdata* data);