Add shellprocess for i386 multiarch

Summary:
Add shellprocess to enable i386.
Bump Standards-Version to 4.5.0.
This provides "plan B" to T143

Test Plan:
 1. Boot live media
 1. Try to install Steam in Discover and it should fail with "dependency resolution failed"
 1. Install Lubuntu
 1. Reboot
 1. `dpkg --print-foreign-architectures` returns `i386`
 1. Install Steam in Discover and it should just work

Reviewers: wxl, tsimonq2

Reviewed By: wxl

Differential Revision: https://phab.lubuntu.me/D75

debian/changelog

@@ -1,3 +1,10 @@
+calamares-settings-ubuntu (1:20.04.2) focal; urgency=medium
+
+  * Add shellprocess to implement i386 multiarch.
+  * Bump Standards-Version to 4.5.0, no changes needed.
+
+ -- Dan Simmons <kc2bez@lubuntu.me>  Mon, 27 Jan 2020 20:46:44 -0500
+
 calamares-settings-ubuntu (1:20.04.1) focal; urgency=medium
 
   * Welcome to the Focal Fossa!

debian/control

@@ -6,7 +6,7 @@ Uploaders: Simon Quigley <tsimonq2@ubuntu.com>
 Build-Depends: debhelper (>= 12),
                intltool,
                qttools5-dev-tools
-Standards-Version: 4.4.0
+Standards-Version: 4.5.0
 Homepage: https://code.launchpad.net/ubuntu-calamares-settings
 Vcs-Git: https://git.launchpad.net/ubuntu-calamares-settings
 Vcs-Browser: https://git.launchpad.net/ubuntu-calamares-settings

lubuntu/modules/shellprocess_add386arch.conf

@@ -0,0 +1,5 @@
+---
+dontChroot: false
+timeout: 30
+script:
+    - command: "/usr/bin/dpkg --add-architecture i386"

lubuntu/settings.conf

@@ -17,6 +17,9 @@ instances:
 - id: bug-LP#1829805
   module: shellprocess
   config: shellprocess_bug-LP#1829805.conf
+- id: add386arch
+  module: shellprocess
+  config: shellprocess_add386arch.conf
 
 sequence:
 - show:
@@ -49,6 +52,7 @@ sequence:
   - bootloader
   - contextualprocess@after_bootloader
   - automirror
+  - shellprocess@add386arch
   - packages
   - shellprocess@logs
   - umount