v3.11.0 (#211)

- PHP 7.4 support
- Improved Webp images support with Cloudflare (Issue [#95](https://github.com/WordOps/WordOps/issues/95)). Nginx will not serve webp images alternative with Cloudflare IP ranges.
- Stack upgrade for adminer
- Check acme.sh installation and setup acme.sh if needed before issuing certificate
- Add `--ufw` to `wo stack status`
- Add Nginx directive `gzip_static on;` to serve precompressed assets with Cache-Enabler or WP-Rocket. (Issue [#207](https://github.com/WordOps/WordOps/issues/207))
- Previous `--php73` & `--php73=off` flags are replaced by `--php72`, `--php73`, `--php74` to switch site's php version
- phpMyAdmin updated to v4.9.2
- Adminer updated to v4.7.5
- Replace dot and dashes by underscores in database names (Issue [#206](https://github.com/WordOps/WordOps/issues/206))
- Increased database name length to 32 characters from domain name + 8 random characters
- typo error in motd-news script (Issue [#204](https://github.com/WordOps/WordOps/issues/204))
- Install Nginx before ngxblocker
- WordOps install/update script text color
- Issue with MySQL stack on Raspbian 9/10
- Typo error  (PR [#205](https://github.com/WordOps/WordOps/pull/205))
- php version in `wo debug` (PR [#209](https://github.com/WordOps/WordOps/pull/209))
- SSL certificates expiration display with shared wildcard certificates

wo/core/aptget.py

@@ -1,6 +1,7 @@
 """WordOps package installation using apt-get module."""
 import subprocess
 import sys
+import os
 
 from sh import ErrorReturnCode, apt_get
 
@@ -222,6 +223,29 @@ class WOAptGet():
         # apt_cache.close()
         return False
 
+    def is_exec(self, package_name):
+        """
+        Check if package is available by looking
+        for an executable or a systemd service related
+        to this package
+        """
+        exec_path = ["/bin", "/usr/bin", "/usr/local/bin",
+                     "/usr/sbin", "/usr/local/sbin"]
+        for path in exec_path:
+            if os.path.exists('{0}/{1}'.format(path, package_name)):
+                return True
+        return False
+
+    def is_selected(self, package_name, packages_list):
+        """
+        Check if package is selected for install/removal/purge
+        in packages_list
+        """
+        for package in packages_list:
+            if package_name == package[2]:
+                return True
+        return False
+
     def download_only(self, package_name, repo_url=None, repo_key=None):
         """
         Similar to `apt-get install --download-only PACKAGE_NAME`