added settings API + fixed bug (#62)

* added settings API + fixed bug

* removed redundant API funcs

* comment clarifications

---------

Co-authored-by: Wyatt <wyatt@modrinth.com>

theseus_gui/src/helpers/settings.js

@@ -0,0 +1,53 @@
+/**
+ * All theseus API calls return serialized values (both return values and errors);
+ * So, for example, addDefaultInstance creates a blank Profile object, where the Rust struct is serialized,
+ *  and deserialized into a usable JS object.
+ */
+import { invoke } from '@tauri-apps/api/tauri'
+
+// Settings object
+/*
+
+Settings {
+    "memory": MemorySettings,
+    "game_resolution": [int int],
+    "custom_java_args": [String ...],
+    "custom_env_args" : [(string, string) ... ]>,
+    "java_8_path": Path (can be null),
+    "java_17_path": Path (can be null),
+    "default_user": Uuid string (can be null),
+    "hooks": Hooks,
+    "max_concurrent_downloads": uint,
+    "version": u32,
+}
+
+Memorysettings {
+    "min": u32, can be null,
+    "max": u32,
+}
+
+*/
+
+// An example test function for getting/setting settings
+export async function test() {
+  // First, print settings and store them to an object
+  let settings = await get()
+  console.log(JSON.stringify(settings))
+
+  // Then set some random settings in that object
+  settings.java_8_path = '/example/path'
+
+  // Set the new settings object
+  await set(settings)
+  console.log(JSON.stringify(await get()))
+}
+
+// Get full settings object
+export async function get() {
+  return await invoke('settings_get')
+}
+
+// Set full settings object
+export async function set(settings) {
+  return await invoke('settings_set', { settings })
+}