Remove / hide useless clickhouse connection types

[ryanhamilton]

user-rh - added standard "clickhouse" and wondered why driver didn't work.

Clickhouse - Is useless as it dosn't have a URL so doesn't download a driver and doesn't throw a proper error when download fails. Is ClickHouse Yandex still useful?

[ryanhamilton]

Note during error - nothing in .log LOGS

[ryanhamilton]

+user-Michael see emails with:

OS=Windows 10
Java=11.0.20
Des=unknown
Stack=java.lang.NoClassDefFoundError: Could not initialize class ru.yandex.clickhouse.ClickHouseDriver
        at java.base/java.lang.Class.forName0(Native Method)
        at java.base/java.lang.Class.forName(Unknown Source)
        at com.timestored.plugins.PluginLoader.getCClass(PluginLoader.java:143)
        at com.timestored.connections.ConnectionManager$MyDriverManagerConnectionFactory.createConnection(ConnectionManager.java:1046)
        at org.apache.commons.dbcp2.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:374)
        at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:571)
        at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:298)
        at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:223)
        at com.timestored.connections.ConnectionManager.getConn(ConnectionManager.java:414)
        at com.timestored.connections.ConnectionManager.testConnection(ConnectionManager.java:525)
        at com.timestored.connections.ConnectionManagerDialog$3.actionPerformed(ConnectionManagerDialog.java:322)
        at java.desktop/javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
        at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)