decimal convertion fix && hurt note feature

[Spzabt-zz]

In Note.cs, the OnlyDecimalConverter class has been added for more accurate processing of "sectionNotes" data. This converter helps filter out incompatible types (anything that isn't decimal or integer), like this (which I found in this mod):

[
    1463.41463414634
    ,2
    ,365.853658536585
    ,[

    ]
]

turns into this:

[
    1463.41463414634,
    2,
    365.853658536585
]

Also added option to skip "Hurt Notes", for example:

[
    24468.75,
    7,
    0,
    "Hurt Note"
]

turns into this:

[
    24468.75,
    2147483647,
    0
]

where the value 2147483647 becomes unrecognized by FNFBot.

In FNFSection within FNFSong.cs, made some adjustments to ensure that the Notes list is correctly populated by adding missing elements or removing extra elements to maintain a valid structure. Because in some mods there could be more than 3 sections in the "sectionNotes" or less (in very rare cases).