Misc: dropped travis builds from the repository

* there is no point in supporting greed

.travis.yml

@@ -1,57 +0,0 @@
-sudo: false
-dist: bionic
-
-language: cpp
-compiler:
-  - clang
-
-git:
-  depth: 1
-
-addons:
-  apt:
-    sources:
-      - sourceline: 'ppa:mhier/libboost-latest'
-#     - sourceline: 'ubuntu-toolchain-r-test'
-    packages:
-      - boost1.68
-      - libssl-dev
-      - libmysqlclient-dev
-      - libreadline6-dev
-      - zlib1g-dev
-      - libbz2-dev
-      - libzmq3-dev
-      - g++-6
-
-services:
-  - mysql
-
-before_install:
-  - git config user.email "travis@build.bot" && git config user.name "Travis CI"
-  - git tag -a -m "Travis build" init
-
-install:
-  - mysql -uroot -e 'create database test_mysql;'
-  - mkdir bin
-  - cd bin
-  - cmake ../ -DWITH_WARNINGS=1 -DWITH_COREDEBUG=0 -DUSE_COREPCH=1 -DUSE_SCRIPTPCH=1 -DTOOLS=1 -DSCRIPTS=dynamic -DSERVERS=1 -DNOJEM=0 -DCMAKE_BUILD_TYPE=Debug -DCMAKE_C_FLAGS="-Werror" -DCMAKE_CXX_FLAGS="-Werror" -DCMAKE_C_FLAGS_DEBUG="-DNDEBUG" -DCMAKE_CXX_FLAGS_DEBUG="-DNDEBUG" -DCMAKE_INSTALL_PREFIX=check_install
-  - cd ..
-  - chmod +x contrib/check_updates.sh
-
-script:
-  - $CXX --version
-  - mysql -uroot < sql/create/create_mysql.sql
-  - mysql -utrinity -ptrinity auth < sql/base/auth_database.sql
-  - ./contrib/check_updates.sh auth 4.3.4 auth localhost
-  - mysql -utrinity -ptrinity characters < sql/base/characters_database.sql
-  - ./contrib/check_updates.sh characters 4.3.4 characters localhost
-  - mysql -utrinity -ptrinity world < sql/base/dev/world_database.sql
-  - mysql -utrinity -ptrinity hotfixes < sql/base/dev/hotfixes_database.sql
-  - cat sql/updates/world/4.3.4/*.sql | mysql -utrinity -ptrinity world
-  - cat sql/updates/hotfixes/4.3.4/*.sql | mysql -utrinity -ptrinity hotfixes
-  - mysql -uroot < sql/create/drop_mysql.sql
-  - cd bin
-  - make -j 8 -k && make install
-  - cd check_install/bin
-  - ./bnetserver --version
-  - ./worldserver --version