convert equalsAsciiL calls to startsWith calls

Convert code like:
    aStr.equalsAsciiL( RTL_CONSTASCII_STRINGPARAM( "ActiveConnection" ) )
to
    aStr.startsWith( "ActiveConnection" )
which compiles down to the same machine code.

Change-Id: Id4b0c5e0f9afe716a468d3afc70374699848dc33
remove unnecessary RTL_CONSTASCII_STRINGPARAM in appendAscii calls

Convert code like:
    aStrBuf.appendAscii( RTL_CONSTASCII_STRINGPARAM( "ln(x)" ));
to:
    aStrBuf.append( "ln(x)" );
which compiles down to the same code.

Change-Id: I24c7cb45ceb32fd7cd6ec7ed203c2a5d746f1c5c
remove unnecessary RTL_CONSTASCII_STRINGPARAM in OString::append

Convert code like:
   aOStringBuf.append( RTL_CONSTASCII_STRINGPARAM( " is missing )") );
to:
   aOStringBuf.append( " is missing )" );
which compiles down to the same code.

Change-Id: I3d8ed0cbf96a881686524a167412d5f303c06b71