New apps for text, slide and spreadsheet

www/common/onlyoffice/build/build.sh

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+git clone https://github.com/ldubost/web-apps.git
+git clone https://github.com/ldubost/sdkjs.git
+cd sdkjs
+make
+cd ..
+rm -rf ../web-apps
+cp -r web-apps/deploy/web-apps ..
+rm -rf ../sdkjs
+cp -r web-apps/deploy/sdkjs ..
+

www/common/onlyoffice/build/update.sh

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+cd web-apps
+git pull
+cd ../sdkjs
+git pull
+make clean