Revert "Update versions for PHP 8.0.21"

This reverts commit 6eedacd.

.appveyor.yml

@@ -0,0 +1,60 @@
+version: "{branch}.build.{build}"
+
+image: Visual Studio 2019
+
+branches:
+        except:
+                - PHP-5.6
+                - PHP-7.0
+
+clone_depth: 64
+
+skip_commits:
+  files:
+    - docs/*
+    - NEWS
+    - UPGRADING
+    - UPGRADING.INTERNALS
+
+cache:
+        - c:\build-cache
+
+environment:
+        PHP_BUILD_CACHE_BASE_DIR: c:\build-cache
+        PHP_BUILD_OBJ_DIR: c:\obj
+        PHP_BUILD_CACHE_SDK_DIR: c:\build-cache\sdk
+        PHP_BUILD_SDK_BRANCH: php-sdk-2.2.0
+        PHP_BUILD_CRT: vs16
+        # ext and env setup for tests
+        #MYSQL_TEST_PASSWD: Password12!
+        #MYSQL_TEST_USER: root
+        #PDO_MYSQL_TEST_DSN: "pgsql:host=127.0.0.1 port=5432 dbname=test user=root password=Password12!"
+        #PDO_MYSQL_TEST_USER: root
+        #PDO_MYSQL_TEST_PASS: Password12!
+        #PGSQL_TEST_CONNSTR: "host=127.0.0.1 dbname=test port=5432 user=postgres password=Password12!"
+        #PDO_PGSQL_TEST_DSN: "pgsql:host=127.0.0.1 port=5432 dbname=test user=postgres password=Password12!"
+        #build permutations
+        matrix:
+                - THREAD_SAFE: 0
+                  OPCACHE: 0
+                  PARALLEL: -j2
+                - THREAD_SAFE: 1
+                  OPCACHE: 1
+                  PARALLEL: -j2
+                  INTRINSICS: AVX
+
+services:
+        # the setup scripts have to be touched, once some other db version is used
+        - mysql
+        - postgresql101
+        - mssql2017
+
+platform:
+        - x64
+          #        - x86
+
+build_script:
+        - appveyor\build.bat
+
+test_script:
+        - appveyor\test.bat

.editorconfig

@@ -0,0 +1,34 @@
+# https://editorconfig.org/
+
+root = true
+
+[*]
+trim_trailing_whitespace = true
+insert_final_newline     = true
+end_of_line              = lf
+charset                  = utf-8
+tab_width                = 4
+
+[{*.{awk,bat,c,cpp,d,h,l,re,skl,w32,y},Makefile*}]
+indent_size              = 4
+indent_style             = tab
+
+[*.{dtd,html,inc,php,phpt,rng,wsdl,xml,xsd,xsl}]
+indent_size              = 4
+indent_style             = space
+
+[*.{ac,m4,sh,yml}]
+indent_size              = 2
+indent_style             = space
+
+[*.md]
+indent_style             = space
+max_line_length          = 80
+
+[COMMIT_EDITMSG]
+indent_size              = 4
+indent_style             = space
+max_line_length          = 80
+
+[*.patch]
+trim_trailing_whitespace = false