Add date and time handling, models, schedule management, storage, and widget support

- Introduced `Dates.swift` for handling date and time in the university's timezone.
- Created `Models.swift` to define data structures for timetable, lessons, and directory search results.
- Implemented `Schedule.swift` for managing lesson slots and timetable functionalities.
- Developed `Storage.swift` for user settings and data persistence.
- Added `Widgets.swift` to create widgets displaying lessons and upcoming classes.

ios/Config/App-Info.plist

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>BGTaskSchedulerPermittedIdentifiers</key>
+	<array>
+		<string>org.xtimms.psu.schedule.refresh</string>
+	</array>
+	<key>CFBundleURLTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleURLName</key>
+			<string>org.xtimms.psu.schedule</string>
+			<key>CFBundleURLSchemes</key>
+			<array>
+				<string>psuschedule</string>
+			</array>
+		</dict>
+	</array>
+	<key>NSAppTransportSecurity</key>
+	<dict>
+		<key>NSAllowsLocalNetworking</key>
+		<true/>
+	</dict>
+	<key>PSUAPIURL</key>
+	<string>https://psu.rumblur.by/</string>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>fetch</string>
+	</array>
+</dict>
+</plist>

ios/Config/App.entitlements

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<!-- The app and its widgets share the saved timetable, notes and settings. -->
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>group.org.xtimms.psu.schedule</string>
+	</array>
+</dict>
+</plist>

ios/Config/AppIcon-Dark.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="1024" height="1024" viewBox="0 0 512 512"><rect width="512" height="512" fill="#0c0e13"/><path d="M142 172h228v200H142z" fill="none" stroke="#9ecaff" stroke-width="24" stroke-linejoin="round"/><path d="M142 226h228M204 146v48M308 146v48" fill="none" stroke="#9ecaff" stroke-width="24" stroke-linecap="round"/><path d="m205 296 35 35 69-71" fill="none" stroke="#81c784" stroke-width="25" stroke-linecap="round" stroke-linejoin="round"/></svg>

ios/Config/AppIcon.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="1024" height="1024" viewBox="0 0 512 512"><defs><linearGradient id="g" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#1a7fd1"/><stop offset="1" stop-color="#004f87"/></linearGradient></defs><rect width="512" height="512" fill="url(#g)"/><path d="M142 172h228v200H142z" fill="none" stroke="#fff" stroke-width="24" stroke-linejoin="round"/><path d="M142 226h228M204 146v48M308 146v48" fill="none" stroke="#fff" stroke-width="24" stroke-linecap="round"/><path d="m205 296 35 35 69-71" fill="none" stroke="#c8efb8" stroke-width="25" stroke-linecap="round" stroke-linejoin="round"/></svg>

ios/Config/Widgets-Info.plist

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.widgetkit-extension</string>
+	</dict>
+</dict>
+</plist>

ios/Config/Widgets.entitlements

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<!-- The app and its widgets share the saved timetable, notes and settings. -->
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>group.org.xtimms.psu.schedule</string>
+	</array>
+</dict>
+</plist>