Added SMS Manager Support

Description:

Related issue (if applicable): n/a

Added SMS Manager Support to Apprise

Source: https://smsmanager.cz
Icon Support: No
Message Format: Text
Message Limit: 160 Characters per message

Account Setup

Syntax

Valid syntax is as follows:

smsmgr://{apikey}@/{toPhoneNo}
smsmgr://{apikey}@/{toPhoneNo1}/{toPhoneNo2}/{toPhoneNoN}

smsmanager:// can also be used as an alias to smsmgr:// if you choose.

Parameter Breakdown

Variable	Required	Description
apikey	Yes	The API Key associated with your SMS Manager Account.
to	*No	A phone number and/or group you wish to send your notification to. You can use comma's to separate multiple entries if you wish. This is an alias to `targets`.
from	*No	This requires approval from the Administrator and provides a `sender` option in the payload. It can not exceed 11 characters according to the documentation. You may also use `?sender=` to set this same value.
batch	No	Send multiple specified notifications in a single batch (1 upstream post to the end server). By default this is set to `no`.
gateway	No	SMS Manager supports the following gateway settings: `high`, `economy`, `low`, and `direct`. By default this is set to `high` if not otherwise specified.

New Service Completion Status

[x] apprise/plugins/NotifySMSGateway.py
[x] KEYWORDS
- add new service into this file (alphabetically).
[x] README.md
- add entry for new service to table (as a quick reference)
[x] packaging/redhat/python-apprise.spec
- add new service into the %global common_description

Checklist

[x] The code change is tested and works locally.
[x] There is no commented out code in this PR.
[x] No lint errors (use flake8)
[x] 100% test coverage

Testing

Anyone can help test this source code as follows:

# Create a virtual environment to work in as follows:
python3 -m venv apprise

# Change into our new directory
cd apprise

# Activate our virtual environment
source bin/activate

# Install the branch
pip install git+https://github.com/caronc/apprise.git@sms-manager-support

# Test out the changes with the following command:
apprise -t "Test Title" -b "Test Message" \
 "smsmgr://apikey/target-phone-no"

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (cda6925) 99.55% compared to head (922b24d) 99.55%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1018 +/- ## ======================================== Coverage 99.55% 99.55% ======================================== Files 130 131 +1 Lines 17281 17397 +116 Branches 3523 3545 +22 ======================================== + Hits 17204 17320 +116 Misses 68 68 Partials 9 9 ```

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caronc / apprise