Swift Package Manager support without RxSwift dependency (#1341)

* feat: SPM support

Using InputAccessoryView dependency without Rx

* feat: SPM support

Add missing imports

* feat: Swift Package Manager support

Added Package description with Assets support for Swift 5.3

* feat: Swift Package Manager support

Remove .swiftpm temp files

* feat: Swift Package Manager support

Ignore .swiftpm temp files

* feat: Swift Package Manager support

Remove Package.resolved

* feat: Swift Package Manager support

Ignore Package.resolved

* feat: Swift Package Manager support

Assets in framework project

* feat: Swift Package Manager support

Fix tests

* feat: Swift Package Manager support

Fix tests

* feat: Swift Package Manager support

Fix tests

* feat: Swift Package Manager support

Try Bundle.module to get MessageKit bundle

* feat: Swift Package Manager support

SPM condition in bundle

* feat: Swift Package Manager support

Remove previous Swift 5.2 version Package.swift

* feat: Swift Package Manager support

Update Readme with SPM installation

MessageKit.podspec

@@ -14,8 +14,7 @@ Pod::Spec.new do |s|
    s.swift_version = '5.0'
 
    s.ios.deployment_target = '11.0'
-   s.ios.resource_bundle = { 'MessageKitAssets' => ['Assets/MessageKitAssets.bundle/Images'] }
-   s.ios.resources = ['Assets/Assets.xcassets']
+   s.ios.resources = ['Sources/Assets.xcassets']
 
    s.dependency 'InputBarAccessoryView', '~> 4.3.0'