Add support for AppImage automous package

[DEVELOPMENT ENVIRONMENT]
* NEW: Add support for AppImage automous package

app/src/gambas3/.src/Packager/FMakeInstall.class

@@ -398,7 +398,7 @@ Public Sub wizInstall_BeforeChange()
       
       bEnabled = False
       For Each sSys In Project.Systems
-        If sSys <> "autotools" And If sSys <> "self" Then
+        If sSys <> "autotools" And If sSys <> "self" And If sSys <> "appimage" Then
           bEnabled = True
           Break
         Endif

app/src/gambas3/.src/Packager/FMakeInstall.form

@@ -321,6 +321,28 @@
           Text = "Mageia"
         }
       }
+      { HBox21 HBox panDistro
+        Name = "HBox21"
+        MoveScaled(43,20,42,9)
+        Tag = "appimage"
+        Padding = 4
+        { PictureBox8 PictureBox
+          MoveScaled(1,1,6,6)
+          Picture = Picture.Load("img/logo/appimage.png")
+          Stretch = True
+          Alignment = Align.Center
+        }
+        { Panel18 Panel
+          MoveScaled(9,1,3,6)
+        }
+        { CheckBox8 CheckBox chkDistro
+          Name = "CheckBox8"
+          MoveScaled(14,2,26,4)
+          #Translate = False
+          Expand = True
+          Text = "AppImage"
+        }
+      }
       { HBox7 HBox panDistro
         Name = "HBox7"
         MoveScaled(0,30,42,9)

app/src/gambas3/install/AppImageAptConfig

@@ -0,0 +1,24 @@
+  apt:
+    arch: amd64
+    allow_unauthenticated: true
+    sources:
+    - sourceline: deb http://mx.archive.ubuntu.com/ubuntu/ bionic main restricted
+    - sourceline: deb http://mx.archive.ubuntu.com/ubuntu/ bionic-updates main restricted
+    - sourceline: deb http://mx.archive.ubuntu.com/ubuntu/ bionic universe
+    - sourceline: deb http://mx.archive.ubuntu.com/ubuntu/ bionic-updates universe
+    - sourceline: deb http://mx.archive.ubuntu.com/ubuntu/ bionic multiverse
+    - sourceline: deb http://mx.archive.ubuntu.com/ubuntu/ bionic-updates multiverse
+    - sourceline: deb http://mx.archive.ubuntu.com/ubuntu/ bionic-backports main restricted
+        universe multiverse
+    - sourceline: deb http://security.ubuntu.com/ubuntu bionic-security main restricted
+    - sourceline: deb http://security.ubuntu.com/ubuntu bionic-security universe
+    - sourceline: deb http://security.ubuntu.com/ubuntu bionic-security multiverse
+    - sourceline: deb http://archive.neon.kde.org/user bionic main
+    - sourceline: deb http://ppa.launchpad.net/gambas-team/gambas3/ubuntu bionic main
+    exclude:
+    - adwaita-icon-theme
+    - adwaita-icon-theme-full
+    - humanity-icon-theme
+    include:
+    - gambas3-runtime
+    - fontconfig

app/src/gambas3/install/AppImageTests

@@ -0,0 +1,21 @@
+#  test:
+#    fedora:
+#      image: appimagecrafters/tests-env:fedora-30
+#      command: ./AppRun
+#      use_host_x: true
+#    debian:
+#      image: appimagecrafters/tests-env:debian-stable
+#      command: ./AppRun
+#      use_host_x: true
+#    arch:
+#      image: appimagecrafters/tests-env:archlinux-latest
+#      command: ./AppRun
+#      use_host_x: true
+#    centos:
+#      image: appimagecrafters/tests-env:centos-7
+#      command: ./AppRun
+#      use_host_x: true
+#    ubuntu:
+#      image: appimagecrafters/tests-env:ubuntu-xenial
+#      command: ./AppRun
+#      use_host_x: true

app/src/gambas3/install/menu/appimage

@@ -0,0 +1 @@
+none