conversation: add emoji reactions support

...app/src/main/java/cx/ring/adapters/ConversationAdapter.kt

.../java/cx/ring/adapters/ConversationMediaGalleryAdapter.kt

...d/app/src/main/java/cx/ring/client/MediaViewerFragment.kt

...p/src/main/java/cx/ring/fragments/ConversationFragment.kt

...ain/java/cx/ring/tv/conversation/TvConversationAdapter.kt

...in/java/cx/ring/tv/conversation/TvConversationFragment.kt

...droid/app/src/main/java/cx/ring/utils/AndroidFileUtils.kt

...ndroid/app/src/main/java/cx/ring/utils/JamiGlideModule.kt

...c/main/java/cx/ring/viewholders/ConversationViewHolder.kt

.../app/src/main/res/drawable/baseline_share_twoton_16dp.xml

...ndroid/app/src/main/res/drawable/outline_file_copy_16.xml

...d/app/src/main/res/drawable/static_rounded_background.xml

ring-android/app/src/main/res/layout/conv_reaction_tag.xml

ring-android/app/src/main/res/layout/item_conv_image_me.xml

...-android/app/src/main/res/layout/item_conv_image_peer.xml

ring-android/app/src/main/res/layout/item_conv_msg_me.xml

ring-android/app/src/main/res/layout/item_conv_msg_peer.xml

ring-android/app/src/main/res/layout/menu_conversation.xml

ring-android/app/src/main/res/values/arrays.xml

ring-android/app/src/main/res/values/dimens.xml