Com_contact default form code style improvements. Closes 4072
[Code Style] Updating docblock comment for onContentPrepareData
Merge pull request #4212 from gunjanpatel/docblock

[Code Style] Updating docblock comment for onContentPrepareData
[fix] System template cleanup. Fixes #4177

Remove unused code

This file tried to load 2 css files that do not exist. This PR removes the call to those files
[fix] Fixed broken TOS modal link. Fixes #4217
[fix] Making error message user-friendly (suggesting fix) and increasing recommended maximum upload size to 8 MB. Fixes #4210

Update warnings.php

Update en-GB.com_installer.ini
Non-descriptive error messages when a package upload fails in com_installer. Fixes #4209
Add in missing line breaks
Merge pull request #4220 from wilsonge/patch-5

[CS] Add in missing line breaks
Fix downloads from HTTPS on servers without a global cacert.pem

Closes gh-4218

## Executive summary

When you have a server where the PHP curl module is not enabled Joomla! resorts to using fopen(). If the server doesn't have a root certificate authority cache made available to PHP, retrieving an HTTPS URL fails. This is obvious with extension updates when the update XML or update package URL is on an SSL site.

## Backwards compatibility issues

None

## Translation impact

None

## Testing

On an affected server try installing an extension from an HTTPS URL. It will fail. After the patch it will succeeed.

## Special notes

This is a trivial patch with a successful test in gh-4218 As a result it can be set immediately RTC.
Merge pull request #4232 from nikosdion/fix/https-download-fopen

Fix downloads from HTTPS on servers without a global cacert.pem