Console: Add X-Content-Type-Options header everywhere (ticket #1763)

apps/i2psnark/java/src/org/klomp/snark/web/BasicServlet.java

...2psnark/java/src/org/klomp/snark/web/I2PSnarkServlet.java

apps/i2ptunnel/jsp/edit.jsp

apps/i2ptunnel/jsp/index.jsp

apps/i2ptunnel/jsp/wizard.jsp

...bapp/src/main/java/net/i2p/imagegen/IdenticonServlet.java

...egen/webapp/src/main/java/net/i2p/imagegen/QRServlet.java

...bapp/src/main/java/net/i2p/imagegen/RandomArtServlet.java

...java/src/net/i2p/router/web/CodedIconRendererServlet.java

apps/routerconsole/jsp/css.jsi

apps/routerconsole/jsp/flags.jsp

apps/routerconsole/jsp/viewhistory.jsp

apps/routerconsole/jsp/viewstat.jsp

apps/routerconsole/jsp/viewtheme.jsp

apps/routerconsole/jsp/xhr1.jsp

apps/susidns/src/jsp/addressbook.jsp

apps/susidns/src/jsp/config.jsp

apps/susidns/src/jsp/details.jsp

apps/susidns/src/jsp/export.jsp

apps/susidns/src/jsp/index.jsp