Rename master to main and update news

Update CI and README to reflect rename.
Update News:
    * Notify users of rename.
    * Update minimum required VS compiler to 2019.
    * Remove notice about versioning. This has been completed.
    * Remove notice about SPIRV folder relocation. It has been 2.5 years
    since this occured.

.github/workflows/continuous_deployment.yml

@@ -20,7 +20,7 @@ on:
     workflow_dispatch:
     push:
         branches:
-            - master
+            - main
 
 jobs:
     linux:
@@ -71,7 +71,7 @@ jobs:
             - name: Zip
               if: ${{ matrix.compiler.cc == 'clang' }}
               env:
-                  ARCHIVE: glslang-master-${{matrix.os.family}}-${{matrix.cmake_build_type}}.zip
+                  ARCHIVE: glslang-main-${{matrix.os.family}}-${{matrix.cmake_build_type}}.zip
               run: |
                   cd build/install
                   zip ${ARCHIVE} \
@@ -92,7 +92,7 @@ jobs:
             - name: Deploy
               if: ${{ matrix.compiler.cc == 'clang' }}
               env:
-                  ARCHIVE: glslang-master-${{matrix.os.family}}-${{matrix.cmake_build_type}}.zip
+                  ARCHIVE: glslang-main-${{matrix.os.family}}-${{matrix.cmake_build_type}}.zip
               uses: actions/github-script@v5
               with:
                   script: |
@@ -142,7 +142,7 @@ jobs:
                   cd ../Test && ./runtests
             - name: Zip
               env:
-                  ARCHIVE: glslang-master-${{matrix.os.family}}-${{matrix.cmake_build_type}}.zip
+                  ARCHIVE: glslang-main-${{matrix.os.family}}-${{matrix.cmake_build_type}}.zip
               run: |
                   cd build/install
                   zip ${ARCHIVE} \
@@ -162,7 +162,7 @@ jobs:
                       lib/libSPIRV-Tools-opt.a
             - name: Deploy
               env:
-                  ARCHIVE: glslang-master-${{matrix.os.family}}-${{matrix.cmake_build_type}}.zip
+                  ARCHIVE: glslang-main-${{matrix.os.family}}-${{matrix.cmake_build_type}}.zip
               uses: actions/github-script@v5
               with:
                   script: |

.github/workflows/continuous_integration.yml

@@ -10,7 +10,7 @@ on:
     workflow_dispatch:
     pull_request:
         branches:
-            - master
+            - main
 
 jobs:
     linux:

.github/workflows/deploy.js

@@ -3,11 +3,11 @@ module.exports = async ({github, context, core}) => {
         await github.rest.git.updateRef({
             owner: context.repo.owner,
             repo: context.repo.repo,
-            ref: 'tags/master-tot',
+            ref: 'tags/main-tot',
             sha: context.sha
         })
     } catch (error) {
-        core.setFailed(`upload master-tot tag; ${error.name}; ${error.message}`)
+        core.setFailed(`upload main-tot tag; ${error.name}; ${error.message}`)
     }
 
     let release
@@ -15,10 +15,10 @@ module.exports = async ({github, context, core}) => {
         release = await github.rest.repos.getReleaseByTag({
             owner: context.repo.owner,
             repo: context.repo.repo,
-            tag: 'master-tot'
+            tag: 'main-tot'
         })
     } catch (error) {
-        core.setFailed(`get the master release; ${error.name}; ${error.message}`)
+        core.setFailed(`get the main release; ${error.name}; ${error.message}`)
     }
 
     try {
@@ -28,7 +28,7 @@ module.exports = async ({github, context, core}) => {
             release_id: release.data.id
         })
     } catch (error) {
-        core.setFailed(`update the master release; ${error.name}; ${error.message}`)
+        core.setFailed(`update the main release; ${error.name}; ${error.message}`)
     }
 
     let release_assets