Rewrite library: native SF Symbol rendering, drop legacy support

- Render app.fill at natural size with draw(at:) instead of draw(in:) to preserve squircle shape
- Add SettingsIconSize enum with standard (32/16pt) and custom sizes
- Use UIGraphicsImageRenderer instead of deprecated UIGraphicsBeginImageContext
- SwiftUI view uses .resizable().scaledToFit() for correct proportions
- Bump to Swift 6.0, iOS 15+, macOS 13+
- Remove CocoaPods support, GitHub templates, and community docs
- Add .build to .gitignore

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ivanvorobei

.github/FUNDING.yml

@@ -4,3 +4,4 @@
 
 # Swift Package Manager
 .swiftpm
+.build

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,22 +1,19 @@
-// swift-tools-version: 5.4
+// swift-tools-version: 6.0
 
 import PackageDescription
 
 let package = Package(
     name: "SettingsIconGenerator",
-    defaultLocalization: "en",
     platforms: [
-        .iOS(.v13),
-        .tvOS(.v13),
-        .macOS(.v11)
+        .iOS(.v15),
+        .macOS(.v13)
     ],
     products: [
         .library(
             name: "SettingsIconGenerator",
             targets: ["SettingsIconGenerator"]
         )
     ],
-    dependencies: [],
     targets: [
         .target(
             name: "SettingsIconGenerator"