Barcode scanner updates (#562)

* Add BUILDING.md

* Replace scaning library

- Out with qr_code_scanner
- In with flutter_zxing

* Update specs for jdk / kotlin / gradle

- NFI what this all means?

* Refactor barcode scanning widget

* Refactor barcode overlay

* Add handlers

* Update release notes

* Fix AppBar color

* Enhance attachment widget

* remove unused import

* Improved icon

* Select theme from main drawer

pubspec.lock

@@ -210,10 +210,10 @@ packages:
     dependency: transitive
     description:
       name: cli_util
-      sha256: "66f86e916d285c1a93d3b79587d94bd71984a66aac4ff74e524cfa7877f1395c"
+      sha256: ff6785f7e9e3c38ac98b2fb035701789de90154024a75b6cb926445e83197d1c
       url: "https://pub.dev"
     source: hosted
-    version: "0.3.5"
+    version: "0.4.2"
   clock:
     dependency: transitive
     description:
@@ -391,10 +391,10 @@ packages:
     dependency: "direct dev"
     description:
       name: flutter_launcher_icons
-      sha256: ce0e501cfc258907842238e4ca605e74b7fd1cdf04b3b43e86c43f3e40a1592c
+      sha256: "619817c4b65b322b5104b6bb6dfe6cda62d9729bd7ad4303ecc8b4e690a67a77"
       url: "https://pub.dev"
     source: hosted
-    version: "0.11.0"
+    version: "0.14.1"
   flutter_localizations:
     dependency: "direct main"
     description: flutter
@@ -466,6 +466,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_zxing:
+    dependency: "direct main"
+    description:
+      name: flutter_zxing
+      sha256: "5b2670f151a6d96643204ff3a781e073739c23a91ef5fc39742bf13fb8287b4c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.8.2"
   frontend_server_client:
     dependency: transitive
     description:
@@ -510,10 +518,10 @@ packages:
     dependency: transitive
     description:
       name: image
-      sha256: "8e9d133755c3e84c73288363e6343157c383a0c6c56fc51afcc5d4d7180306d6"
+      sha256: f31d52537dc417fdcde36088fdf11d191026fd5e4fae742491ebd40e5a8bea7d
       url: "https://pub.dev"
     source: hosted
-    version: "3.3.0"
+    version: "4.3.0"
   image_picker:
     dependency: "direct main"
     description:
@@ -750,10 +758,10 @@ packages:
     dependency: "direct main"
     description:
       name: package_info_plus
-      sha256: a75164ade98cb7d24cfd0a13c6408927c6b217fa60dee5a7ff5c116a58f28918
+      sha256: da8d9ac8c4b1df253d1a328b7bf01ae77ef132833479ab40763334db13b91cce
       url: "https://pub.dev"
     source: hosted
-    version: "8.0.2"
+    version: "8.1.1"
   package_info_plus_platform_interface:
     dependency: transitive
     description:
@@ -858,14 +866,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.4"
-  qr_code_scanner:
-    dependency: "direct main"
-    description:
-      name: qr_code_scanner
-      sha256: f23b68d893505a424f0bd2e324ebea71ed88465d572d26bb8d2e78a4749591fd
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.0.1"
   rxdart:
     dependency: transitive
     description: