Enable filter modes

[maning]

Current JOSM filter modes are:

• E (Enable)
• H (Hide elements)
• I (Inverse Filter)

[planemad]

@aarthykc @maning does this make sense for a filter object:

"filters": [
{
"query": "boundary: | leisure: | landuse: | waterway: | amenity: | natural: | building:"
"state":{
"mode":"replace"
"enabled":true,
"hide":false,
"invert":false
}
}
]

[maning]

@planemad, make sense to me.