added tld library, fix add space after dot in domain names

- added tld library, so "Common Fixes" mod can detect domain names and won't add spaces after each dot in them.
- fix HI_before_colon_noncaps, so it won't remove http: from URLs.

libs/tld/exceptions.py

@@ -0,0 +1,56 @@
+__author__ = 'Artur Barseghyan'
+__copyright__ = '2013-2020 Artur Barseghyan'
+__license__ = 'MPL-1.1 OR GPL-2.0-only OR LGPL-2.1-or-later'
+__all__ = (
+    'TldBadUrl',
+    'TldDomainNotFound',
+    'TldImproperlyConfigured',
+    'TldIOError',
+)
+
+
+class TldIOError(IOError):
+    """TldIOError.
+
+    Supposed to be thrown when problems with reading/writing occur.
+    """
+
+
+class TldDomainNotFound(ValueError):
+    """TldDomainNotFound.
+
+    Supposed to be thrown when domain name is not found (didn't match) the
+    local TLD policy.
+    """
+
+    def __init__(self, domain_name):
+        super(TldDomainNotFound, self).__init__(
+            "Domain %s didn't match any existing TLD name!" % domain_name
+        )
+
+
+class TldBadUrl(ValueError):
+    """TldBadUrl.
+
+    Supposed to be thrown when bad URL is given.
+    """
+
+    def __init__(self, url):
+        super(TldBadUrl, self).__init__("Is not a valid URL %s!" % url)
+
+
+class TldImproperlyConfigured(Exception):
+    """TldImproperlyConfigured.
+
+    Supposed to be thrown when code is improperly configured. Typical use-case
+    is when user tries to use `get_tld` function with both `search_public` and
+    `search_private` set to False.
+    """
+
+    def __init__(self, msg=None):
+        if msg is None:
+            msg = "Improperly configured."
+        else:
+            msg = "Improperly configured. %s" % msg
+
+        super(TldImproperlyConfigured, self).__init__(msg)